mysql decode 函数

MySQL中的DECODE函数是用于实现日期和字符之间的相互转换的方法。DECODE函数的使用方法如下：如果expr1不为NULL，则DECODE函数的返回值为expr1；否则返回值为expr2。DECODE函数的返回值可以是数字或字符串，具体取决于上下文。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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