sql从一堆数字中查询出正数的总个数和负数总个数

数据库 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 结果 case when使用学习http://www.javashuo.com/article/p-n

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