sql從一堆數字中查詢出正數的總個數和負數總個數

數據庫 sql SELECT sum(CASE WHEN mark < 0 THEN 1 ELSE 0 END) AS markReduce, sum(CASE WHEN mark >= 0 THEN 1 ELSE 0 END) AS markAdd FROM evaluation_log 結果 case when使用學習http://www.javashuo.com/article/p-n

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