ThinkChat2.0新版上线,更智能更精彩,支持会话、画图、阅读、搜索等,送10W Token,即刻开启你的AI之旅 广告
# SQLite 语法 SQLite 是遵循一套独特的称为语法的规则和准则。本教程列出了所有基本的 SQLite 语法,向您提供了一个 SQLite 快速入门。 ## 大小写敏感性 有个重要的点值得注意,SQLite 是**不区分大小写**的,但也有一些命令是大小写敏感的,比如 **GLOB** 和 **glob** 在 SQLite 的语句中有不同的含义。 ## 注释 SQLite 注释是附加的注释,可以在 SQLite 代码中添加注释以增加其可读性,他们可以出现在任何空白处,包括在表达式内和其他 SQL 语句的中间,但它们不能嵌套。 SQL 注释以两个连续的 "-" 字符(ASCII 0x2d)开始,并扩展至下一个换行符(ASCII 0x0a)或直到输入结束,以先到者为准。 您也可以使用 C 风格的注释,以 "/*" 开始,并扩展至下一个 "*/" 字符对或直到输入结束,以先到者为准。C 庚哥的注释可以跨越多行。 ``` sqlite>.help -- This is a single line comment ``` ## SQLite 语句 所有的 SQLite 语句可以以任何关键字开始,如 SELECT、INSERT、UPDATE、DELETE、ALTER、DROP 等,所有的语句以分号(;)结束。 ## SQLite ANALYZE 语句: ``` ANALYZE; or ANALYZE database_name; or ANALYZE database_name.table_name; ``` ## SQLite AND/OR 子句: ``` SELECT column1, column2....columnN FROM table_name WHERE CONDITION-1 {AND|OR} CONDITION-2; ``` ## SQLite ALTER TABLE 语句: ``` ALTER TABLE table_name ADD COLUMN column_def...; ``` ## SQLite ALTER TABLE 语句(Rename): ``` ALTER TABLE table_name RENAME TO new_table_name; ``` ## SQLite ATTACH DATABASE 语句: ``` ATTACH DATABASE 'DatabaseName' As 'Alias-Name'; ``` ## SQLite BEGIN TRANSACTION 语句: ``` BEGIN; or BEGIN EXCLUSIVE TRANSACTION; ``` ## SQLite BETWEEN 子句: ``` SELECT column1, column2....columnN FROM table_name WHERE column_name BETWEEN val-1 AND val-2; ``` ## SQLite COMMIT 语句: ``` COMMIT; ``` ## SQLite CREATE INDEX 语句: ``` CREATE INDEX index_name ON table_name ( column_name COLLATE NOCASE ); ``` ## SQLite CREATE UNIQUE INDEX 语句: ``` CREATE UNIQUE INDEX index_name ON table_name ( column1, column2,...columnN); ``` ## SQLite CREATE TABLE 语句: ``` CREATE TABLE table_name( column1 datatype, column2 datatype, column3 datatype, ..... columnN datatype, PRIMARY KEY( one or more columns ) ); ``` ## SQLite CREATE TRIGGER 语句: ``` CREATE TRIGGER database_name.trigger_name BEFORE INSERT ON table_name FOR EACH ROW BEGIN stmt1; stmt2; .... END; ``` ## SQLite CREATE VIEW 语句: ``` CREATE VIEW database_name.view_name AS SELECT statement....; ``` ## SQLite CREATE VIRTUAL TABLE 语句: ``` CREATE VIRTUAL TABLE database_name.table_name USING weblog( access.log ); or CREATE VIRTUAL TABLE database_name.table_name USING fts3( ); ``` ## SQLite COMMIT TRANSACTION 语句: ``` COMMIT; ``` ## SQLite COUNT 子句: ``` SELECT COUNT(column_name) FROM table_name WHERE CONDITION; ``` ## SQLite DELETE 语句: ``` DELETE FROM table_name WHERE {CONDITION}; ``` ## SQLite DETACH DATABASE 语句: ``` DETACH DATABASE 'Alias-Name'; ``` ## SQLite DISTINCT 子句: ``` SELECT DISTINCT column1, column2....columnN FROM table_name; ``` ## SQLite DROP INDEX 语句: ``` DROP INDEX database_name.index_name; ``` ## SQLite DROP TABLE 语句: ``` DROP TABLE database_name.table_name; ``` ## SQLite DROP VIEW 语句: ``` DROP INDEX database_name.view_name; ``` ## SQLite DROP TRIGGER 语句: ``` DROP INDEX database_name.trigger_name; ``` ## SQLite EXISTS 子句: ``` SELECT column1, column2....columnN FROM table_name WHERE column_name EXISTS (SELECT * FROM table_name ); ``` ## SQLite EXPLAIN 语句: ``` EXPLAIN INSERT statement...; or EXPLAIN QUERY PLAN SELECT statement...; ``` ## SQLite GLOB 子句: ``` SELECT column1, column2....columnN FROM table_name WHERE column_name GLOB { PATTERN }; ``` ## SQLite GROUP BY 子句: ``` SELECT SUM(column_name) FROM table_name WHERE CONDITION GROUP BY column_name; ``` ## SQLite HAVING 子句: ``` SELECT SUM(column_name) FROM table_name WHERE CONDITION GROUP BY column_name HAVING (arithematic function condition); ``` ## SQLite INSERT INTO 语句: ``` INSERT INTO table_name( column1, column2....columnN) VALUES ( value1, value2....valueN); ``` ## SQLite IN 子句: ``` SELECT column1, column2....columnN FROM table_name WHERE column_name IN (val-1, val-2,...val-N); ``` ## SQLite Like 子句: ``` SELECT column1, column2....columnN FROM table_name WHERE column_name LIKE { PATTERN }; ``` ## SQLite NOT IN 子句: ``` SELECT column1, column2....columnN FROM table_name WHERE column_name NOT IN (val-1, val-2,...val-N); ``` ## SQLite ORDER BY 子句: ``` SELECT column1, column2....columnN FROM table_name WHERE CONDITION ORDER BY column_name {ASC|DESC}; ``` ## SQLite PRAGMA 语句: ``` PRAGMA pragma_name; For example: PRAGMA page_size; PRAGMA cache_size = 1024; PRAGMA table_info(table_name); ``` ## SQLite RELEASE SAVEPOINT 语句: ``` RELEASE savepoint_name; ``` ## SQLite REINDEX 语句: ``` REINDEX collation_name; REINDEX database_name.index_name; REINDEX database_name.table_name; ``` ## SQLite ROLLBACK 语句: ``` ROLLBACK; or ROLLBACK TO SAVEPOINT savepoint_name; ``` ## SQLite SAVEPOINT 语句: ``` SAVEPOINT savepoint_name; ``` ## SQLite SELECT 语句: ``` SELECT column1, column2....columnN FROM table_name; ``` ## SQLite UPDATE 语句: ``` UPDATE table_name SET column1 = value1, column2 = value2....columnN=valueN [ WHERE CONDITION ]; ``` ## SQLite VACUUM 语句: ``` VACUUM; ``` ## SQLite WHERE 子句: ``` SELECT column1, column2....columnN FROM table_name WHERE CONDITION; ```