50 个高级 sql 语句

首先放一个被两次面试都问到的题：mysql 一张表user存储以下数据面试 实现：sql sql：数据库 select name as 姓名, sum(case degree when 'A' then 1 else 0 end) as A, sum(case degree when 'B' then 1 else 0 end) as B, sum(case degree when 'C

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