50 個高級 sql 語句

首先放一個被兩次面試都問到的題：mysql 一張表user存儲以下數據面試 實現：sql sql：數據庫 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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