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SQL中关于条件Count的查询语句问题

时间:2016-08-26 15:30:34      阅读:196      评论:0      收藏:0      [点我收藏+]

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create table abc(A int,B int) 

Select A,count(B) as total from ABC group by A
Select A,count(B) as total1 from ABC where B > 30 group by A
Select A,count(B) as totlal2 from ABC where B > 20 group by A

 

如何合并这三个查询?
得到一个查询结果:
A,total,total1,total2

 

答:

Select A,
count(B) as total,
sum(case when B > 30 then 1 else 0 end) as total1,
sum(case when B > 20 then 1 else 0 end) as total2 
from ABC group by A

 

SQL中关于条件Count的查询语句问题

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原文地址:http://www.cnblogs.com/xiao-momo/p/5810335.html

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