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发布于 2016-03-30 / 4 阅读
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mysql-函数if多值多结果判断-243573295

if语句

案例:同样统计男女生人数,语句如下:

SELECT school,COUNT(school) 人数,SUM(IF(sex='',1,0)) 男生数,SUM(IF(sex='',1,0)) 女生数, 
  SUM(IF(pass=1,1,0)) pass1,SUM(IF(pass=0,1,0)) pass0,
  SUM(IF(state=1,1,0)) state1,SUM(IF(state=0,1,0)) state0
FROM sch 
  GROUP BY sex,school