[5.1 概述](5.1%E6%A6%82%E8%BF%B0.md) [5.2 等号操作符](5.2%E7%AD%89%E5%8F%B7%E6%93%8D%E4%BD%9C%E7%AC%A6.md) [5.3不等号操作符](5.3%E4%B8%8D%E7%AD%89%E5%8F%B7%E6%93%8D%E4%BD%9C%E7%AC%A6.md) [5.4 between … and …操作符](5.4between%E2%80%A6and%E2%80%A6%E6%93%8D%E4%BD%9C%E7%AC%A6.md) [5.5 is null](5.5isnull.md) [5.6 and](5.6and.md) [5.7 or](5.7or.md) [5.8 表达式的优先级](5.8%E8%A1%A8%E8%BE%BE%E5%BC%8F%E7%9A%84%E4%BC%98%E5%85%88%E7%BA%A7.md) [5.9 in](5.9in.md) [5.10 not](5.10not.md) [5.11 like](5.11like.md)