去重查询表mysql 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

2、group by

select count(1) from Course group by CName
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原文地址：https://www.cnblogs.com/lu2527/p/10824847.html