mysql 中case和when

在MySQL中，CASE和WHEN语句用于计算条件列表并返回多个可能结果表达式之一。CASE具有两种格式：简单CASE函数将某个表达式与一组简单表达式进行比较以确定结果，而CASE搜索函数计算一组布尔表达式并返回第一个为真的结果表达式。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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