Home Database Mysql Tutorial 检索表上某一字段的不重复记录

检索表上某一字段的不重复记录

Jun 07, 2016 pm 05:39 PM
Field Search Record repeat

select --要获取的目标字段列表 sys_menu.id, sys_menu.[order], sys_menu.parentid, sys_menu.[Name], sys_menu.url, sys_menu.icon, sys_menu.controllername, sys_menu.actionname, sys_menu.ismenu from priv_privilege --联合查询 left join sys_menu o

select

--要获取的目标字段列表
sys_menu.id,
sys_menu.[order],
sys_menu.parentid,
sys_menu.[Name],
sys_menu.url,
sys_menu.icon,
sys_menu.controllername,
sys_menu.actionname,
sys_menu.ismenu
from
priv_privilege

--联合查询
left join sys_menu on priv_privilege.privtypeid=sys_menu.id
where priv_privilege.id in
(

--关键在这里:通过这下面的语句将不重复的记录ID先select出来通过group by 语句
select
min(id)
from
priv_privilege
where
(privMaster='user' and privmasterid=1) or (privMaster='role' and privmasterid in(1,2,3))
group by
privtypeid
)

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