mysql语法中的条件判断

在MySQL语法中，可以使用WHERE关键字进行条件判断。WHERE关键字可以配合比较运算符（如=、<、>、<=、>=、<>等）和逻辑运算符（如AND、OR、NOT等）来指定筛选条件。通过使用WHERE关键字，可以实现对数据的筛选并返回满足指定条件的行。例如，可以使用WHERE子句来筛选出年龄为9或12的学生记录：SELECT * FROM student WHERE age IN (9, 12)。这个查询将返回年龄为9或12的学生记录。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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