where和having
作者:互联网
测试数据
1、where作用是将不符合where条件的行去掉,不能包含聚合函数
select * from accu where buss_month='202109'
2、having是用在分组之后过滤数据,筛选满足条件的组,条件中经常包含聚合函数
select day_code,buss_month,count(*) from accu where buss_month='202109' group by day_code,buss_month
筛选数据
select day_code,buss_month,count(*) from accu where buss_month='202109' group by day_code,buss_month having count(*)>1
标签:code,buss,day,202109,month,where,having 来源: https://www.cnblogs.com/muhai/p/15456031.html