mysql加减乘除，求余，求平均值,查询不等于某数值

1.mysql加减乘除操做：mysql mysql> select score,score+5,score-5,score*5,score/5 from 4a; +-------+---------+---------+---------+---------+ | score | score+5 | score-5 | score*5 | score/5 | +-------+---------+

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