标签:count 02 group 23% MYSQL when mysql where
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 自己的例子 select count(1) from origin_crx_data where create_time like '2019-02-23%' and source='12345' select count(1) from origin_crx_data where active_time like '2019-02-23%' and source='12345' 合并为一条sql SELECT sum(case when create_time like '2019-02-23%' then 1 else 0 end) as inst_count, sum(case when active_time like '2019-02-23%' then 1 else 0 end) as active_count FROM origin_crx_data where source='12345'
原文链接:https://blog.csdn.net/weixin_35952362/article/details/113127237
标签:count,02,group,23%,MYSQL,when,mysql,where 来源: https://www.cnblogs.com/chong-zuo3322/p/15723024.html
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