sql case when then else

原創 爱吃芒果de仙女 2020-07-05 23:59

今天写sql的时候，用了这个条件

我就把这个讲解下吧，初学者可能一开始看不懂

case when s_score is null then 0 else s_score end

意思就是

当s_score值为空的时候就等于0

否则取它本身的值

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