MySQL查詢某個字段爲某值的次數統計SQL語句

SELECT GoodID,sum(if(Level = 1, 1, 0)) as Better,sum(if(Level = 0, 1, 0)) as Nomal,sum(if(Level = -1, 1, 0)) as Bad from evaluates GROUP BY GoodID;SELECT GoodID,sum(if(Level = 1, 1, 0)) as Better,sum(

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