mysql去重查询表中数据

1、distinct

select count(distinct CName) from teble
select count(CName) from (select distinct CName from Course) as temp
SELECT  DISTINCT text_zhcn FROM dms_menuconfig  -- 去重查询表中数据
select DISTINCT(user_id) from user_info where children_merchant_id='kuaiditong';

 

2、group by

select count(1) from Course group by CName

 

文档：mysql去重查询表中数据.note
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来源：https://www.cnblogs.com/LinHuChongChongChong/p/11884830.html