函数和操作符-一 · postgresql手册

### [PostgreSQL学习手册(函数和操作符<一>)](http://www.cnblogs.com/stephen-liu74/archive/2012/05/02/2294071.html) Posted on 2012-05-02 07:43 [Stephen_Liu](http://www.cnblogs.com/stephen-liu74/) 阅读(1689) 评论(0) [编辑](http://www.cnblogs.com/stephen-liu74/admin/EditPosts.aspx?postid=2294071) [收藏](http://www.cnblogs.com/stephen-liu74/archive/2012/05/02/2294071.html#) ![](https://box.kancloud.cn/2015-10-30_5632e1b6d6c20.jpg) **一、逻辑操作符：** 常用的逻辑操作符有：**AND**、**OR**和**NOT**。其语义与其它编程语言中的逻辑操作符完全相同。 **二、比较操作符：** 下面是PostgreSQL中提供的比较操作符列表：** ** | **操作符** | **描述** | |-----|-----| | < | 小于 | | > | 大于 | | <= | 小于或等于 | | >= | 大于或等于 | | = | 等于 | | != | 不等于 | **** 比较操作符可以用于所有可以比较的数据类型。所有比较操作符都是双目操作符，且返回boolean类型。除了比较操作符以外，我们还可以使用BETWEEN语句，如： a **BETWEEN** x **AND** y 等效于 a >= x **AND** a <= y a **NOT BETWEEN** x **AND** y 等效于 a < x **OR** a > y **三、数学函数和操作符：** 下面是PostgreSQL中提供的数学操作符列表： | **操作符** | **描述** | **例子** | **结果** | |-----|-----|-----|-----| | + | 加 | 2 + 3 | 5 | | - | 减 | 2 - 3 | -1 | | * | 乘 | 2 * 3 | 6 | | / | 除 | 4 / 2 | 2 | | % | 模 | 5 % 4 | 1 | | ^ | 幂 | 2.0 ^ 3.0 | 8 | | |/ | 平方根 | |/ 25.0 | 5 | | ||/ | 立方根 | ||/ 27.0 | 3 | | ! | 阶乘 | 5 ! | 120 | | !! | 阶乘 | !! 5 | 120 | | @ | 绝对值 | @ -5.0 | 5 | | & | 按位AND | 91 & 15 | 11 | | | | 按位OR | 32 | 3 | 35 | | # | 按位XOR | 17 # 5 | 20 | | ~ | 按位NOT | ~1 | -2 | | << | 按位左移 | 1 << 4 | 16 | | >> | 按位右移 | 8 >> 2 | 2 | 按位操作符只能用于整数类型，而其它的操作符可以用于全部数值数据类型。按位操作符还可以用于位串类型bit和bit varying，下面是PostgreSQL中提供的数学函数列表，需要说明的是，这些函数中有许多都存在多种形式，区别只是参数类型不同。除非特别指明，任何特定形式的函数都返回和它的参数相同的数据类型。 <table style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; MARGIN: 0px auto; WIDTH: 650px; BORDER-COLLAPSE: collapse; HEIGHT: 573px; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; border-image: initial" border="0" align="center"><tbody><tr><td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; TEXT-ALIGN: center; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">函数</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; TEXT-ALIGN: center; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">返回类型 </td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; TEXT-ALIGN: center; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">描述</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; TEXT-ALIGN: center; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">例子 </td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; TEXT-ALIGN: center; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">结果</td></tr><tr><td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">abs(x)</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial"> </td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">绝对值</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">abs(-17.4)</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">17.4</td></tr><tr><td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">cbrt(double)</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial"> </td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">立方根</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">cbrt(27.0)</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">3</td></tr><tr><td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">ceil(double/numeric)</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial"> </td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">不小于参数的最小的整数</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">ceil(-42.8)</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">-42</td></tr><tr><td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">degrees(double) </td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial"> </td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">把弧度转为角度</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">degrees(0.5)</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">28.6478897565412</td></tr><tr><td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">exp(double/numeric)</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial"> </td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">自然指数</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">exp(1.0)</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">2.71828182845905</td></tr><tr><td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">floor(double/numeric)</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial"> </td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">不大于参数的最大整数</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">floor(-42.8)</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">-43</td></tr><tr><td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">ln(double/numeric)</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial"> </td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">自然对数</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">ln(2.0)</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">0.693147180559945</td></tr><tr><td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">log(double/numeric)</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial"> </td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">10为底的对数</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">log(100.0)</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">2</td></tr><tr><td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">log(b numeric,x numeric)</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial"> </td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">numeric指定底数的对数</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">log(2.0, 64.0)</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">6.0000000000</td></tr><tr><td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">mod(y, x)</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial"> </td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">取余数</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">mod(9,4)</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">1</td></tr><tr><td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">pi() </td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">double</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">"π"常量</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">pi() </td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">3.14159265358979</td></tr><tr><td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">power(a double, b double)</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">double</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">求a的b次幂</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">power(9.0, 3.0)</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">729</td></tr><tr><td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">power(a numeric, b numeric)</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">numeric</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">求a的b次幂</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">power(9.0, 3.0)</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">729</td></tr><tr><td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">radians(double)</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">double</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">把角度转为弧度</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">radians(45.0)</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">0.785398163397448</td></tr><tr><td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">random()</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">double</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">0.0到1.0之间的随机数值</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">random()</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial"> </td></tr><tr><td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">round(double/numeric)</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial"> </td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">圆整为最接近的整数</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">round(42.4)</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">42</td></tr><tr><td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">round(v numeric, s int)</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">numeric</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">圆整为s位小数数字</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">round(42.438,2)</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">42.44</td></tr><tr><td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">sign(double/numeric)</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial"> </td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">参数的符号(-1,0,+1) </td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">sign(-8.4)</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">-1</td></tr><tr><td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">sqrt(double/numeric)</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial"> </td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">平方根</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">sqrt(2.0)</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">1.4142135623731</td></tr><tr><td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">trunc(double/numeric)</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial"> </td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">截断(向零靠近)</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">trunc(42.8)</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">42</td></tr><tr><td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">trunc(v numeric, s int)</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">numeric</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">截断为s小数位置的数字</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">trunc(42.438,2)</td> <td style="BORDER-BOTTOM: rgb(192,192,192) 1px solid; BORDER-LEFT: rgb(192,192,192) 1px solid; PADDING-BOTTOM: 3px; PADDING-LEFT: 3px; PADDING-RIGHT: 3px; BORDER-COLLAPSE: collapse; FONT-SIZE: 12px; WORD-BREAK: normal !important; BORDER-TOP: rgb(192,192,192) 1px solid; BORDER-RIGHT: rgb(192,192,192) 1px solid; PADDING-TOP: 3px; border-image: initial">42.43</td></tr></tbody></table> ** **三角函数列表： | **函数** | **描述** | |-----|-----| | acos(x) | 反余弦 | | asin(x) | 反正弦 | | atan(x) | 反正切 | | atan2(x, y) | 正切 y/x 的反函数 | | cos(x) | 余弦 | | cot(x) | 余切 | | sin(x) | 正弦 | | tan(x) | 正切 | **四、字符串函数和操作符：** 下面是PostgreSQL中提供的字符串操作符列表： | **函数** | **返回类型** | **描述** | **例子** | **结果** | |-----|-----|-----|-----|-----| | string || string | text | 字串连接 | 'Post' || 'greSQL' | PostgreSQL | | bit_length(string) | int | 字串里二进制位的个数 | bit_length('jose') | 32 | | char_length(string) | int | 字串中的字符个数 | char_length('jose') | 4 | | convert(string using conversion_name) | text | 使用指定的转换名字改变编码。 | convert('PostgreSQL' using iso_8859_1_to_utf8) | 'PostgreSQL' | | lower(string) | text | 把字串转化为小写 | lower('TOM') | tom | | octet_length(string) | int | 字串中的字节数 | octet_length('jose') | 4 | | overlay(string placing string from int [for int]) | text | 替换子字串 | overlay('Txxxxas' placing 'hom' from 2 for 4) | Thomas | | position(substring in string) | int | 指定的子字串的位置 | position('om' in 'Thomas') | 3 | | substring(string [from int] [for int]) | text | 抽取子字串 | substring('Thomas' from 2 for 3) | hom | | substring(string from pattern) | text | 抽取匹配 POSIX 正则表达式的子字串 | substring('Thomas' from '...$') | mas | | substring(string from pattern for escape) | text | 抽取匹配SQL正则表达式的子字串 | substring('Thomas' from '%#"o_a#"_' for '#') | oma | | trim([leading | trailing | both] [characters] from string) | text | 从字串string的开头/结尾/两边/ 删除只包含characters(缺省是一个空白)的最长的字串 | trim(both 'x' from 'xTomxx') | Tom | | upper(string) | text | 把字串转化为大写。 | upper('tom') | TOM | | ascii(text) | int | 参数第一个字符的ASCII码 | ascii('x') | 120 | | btrim(string text [, characters text]) | text | 从string开头和结尾删除只包含在characters里(缺省是空白)的字符的最长字串 | btrim('xyxtrimyyx','xy') | trim | | chr(int) | text | 给出ASCII码的字符 | chr(65) | A | | convert(string text, [src_encoding name,] dest_encoding name) | text | 把字串转换为dest_encoding | convert( 'text_in_utf8', 'UTF8', 'LATIN1') | 以ISO 8859-1编码表示的text_in_utf8 | | initcap(text) | text | 把每个单词的第一个子母转为大写，其它的保留小写。单词是一系列字母数字组成的字符，用非字母数字分隔。 | initcap('hi thomas') | Hi Thomas | | length(string text) | int | string中字符的数目 | length('jose') | 4 | | lpad(string text, length int [, fill text]) | text | 通过填充字符fill(缺省时为空白)，把string填充为长度length。如果string已经比length长则将其截断(在右边)。 | lpad('hi', 5, 'xy') | xyxhi | | ltrim(string text [, characters text]) | text | 从字串string的开头删除只包含characters(缺省是一个空白)的最长的字串。 | ltrim('zzzytrim','xyz') | trim | | md5(string text) | text | 计算给出string的MD5散列，以十六进制返回结果。 | md5('abc') | | | repeat(string text, number int) | text | 重复string number次。 | repeat('Pg', 4) | PgPgPgPg | | replace(string text, from text, to text) | text | 把字串string里出现地所有子字串from替换成子字串to。 | replace('abcdefabcdef', 'cd', 'XX') | abXXefabXXef | | rpad(string text, length int [, fill text]) | text | 通过填充字符fill(缺省时为空白)，把string填充为长度length。如果string已经比length长则将其截断。 | rpad('hi', 5, 'xy') | hixyx | | rtrim(string text [, character text]) | text | 从字串string的结尾删除只包含character(缺省是个空白)的最长的字 | rtrim('trimxxxx','x') | trim | | split_part(string text, delimiter text, field int) | text | 根据delimiter分隔string返回生成的第field个子字串(1 Base)。 | split_part('abc~@~def~@~ghi', '~@~', 2) | def | | strpos(string, substring) | text | 声明的子字串的位置。 | strpos('high','ig') | 2 | | substr(string, from [, count]) | text | 抽取子字串。 | substr('alphabet', 3, 2) | ph | | to_ascii(text [, encoding]) | text | 把text从其它编码转换为ASCII。 | to_ascii('Karel') | Karel | | to_hex(number int/bigint) | text | 把number转换成其对应地十六进制表现形式。 | to_hex(9223372036854775807) | 7fffffffffffffff | | translate(string text, from text, to text) | text | 把在string中包含的任何匹配from中的字符的字符转化为对应的在to中的字符。 | translate('12345', '14', 'ax') | a23x5 | **五、位串函数和操作符：** 对于类型bit和bit varying，除了常用的比较操作符之外，还可以使用以下列表中由PostgreSQL提供的位串函数和操作符，其中&、|和#的位串操作数必须等长。在移位的时候，保留原始的位串的的长度。 | **操作符** | **描述** | **例子** | **结果** | |-----|-----|-----|-----| | || | 连接 | B'10001' || B'011' | 10001011 | | & | 按位AND | B'10001' & B'01101' | 00001 | | | | 按位OR | B'10001' | B'01101' | 11101 | | # | 按位XOR | B'10001' # B'01101' | 11100 | | ~ | 按位NOT | ~ B'10001' | 01110 | | << | 按位左移 | B'10001' << 3 | 01000 | | >> | 按位右移 | B'10001' >> 2 | 00100 | 除了以上列表中提及的操作符之外，位串还可以使用字符串函数：length， bit_length， octet_length， position， substring。此外，我们还可以在整数和bit之间来回转换，如： * MyTest=# SELECT 44::bit(10);* bit ------------ 0000101100 (1 row) * MyTest=# SELECT 44::bit(3);* bit ----- 100 (1 row) *MyTest=# SELECT cast(-44 as bit(12));* bit -------------- 111111010100 (1 row) *MyTest=# SELECT '1110'::bit(4)::integer;* int4 ------ 14 (1 row) 注意：如果只是转换为"bit"，意思是转换成bit(1)，因此只会转换成整数的最低位。 *该博客中提供的所有信息均源自PostgreSQL官方文档，编写该篇博客的主要目的是便于今后的查阅，特此声明。* 分类: [PostgreSQL](http://www.cnblogs.com/stephen-liu74/category/343171.html)