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统计某一字段等于不同值的个数的sql语句(分享)_MySQL

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2016-06-01 13:29:581447browse

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本文介绍下,用一条sql语句统计某一字段等于不同值的个数,方法很独特,有需要的朋友参考下。表t,数据: id      type
001     1
001     0
002     1
001     0
002     0
001     1
001     0
002     0

要求:
统计不同id,type分别为0的,1的个数。

sql语句:
 

复制代码代码示例:select 
id,sum(case when type=0 then 1 else 0 end) as 0,sum(case when type=1 then 1 else 0 end) as 1 
from t 
group by id

查询结果:
 

id     0    1
001    3    2
002    2    1

本文出处参考:http://www.jbxue.com/db/11867.html 

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