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覆巢之下焉有完卵。出来道上混,迟早是要还的。

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sql语句一例：多表联合查询(转)

2008-03-20 10:01:19| 分类：默认分类 | 标签： |举报 |字号大中小订阅

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1.测试数据库

部门表

deptId deptName

1 研发部

2 市场部

3 客服部

雇员表

empId empName deptId

1 小罗 1

2 罗曾英 3

问题：

写sql语句，给定一个部门名称，查询该部门下的雇员

1.连接法

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select t2.* from department t1
join employee t2 on t1.deptId=t2.deptId
where t1.deptName='研发部'

select t2.* from department t1join employee t2 on t1.deptId=t2.deptIdwhere t1.deptName='研发部'2.子查询法

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select * from employee
where depId in
(
select deptId from department where deptName='研发部'
)

我用过的最长的联合查询代码实例,大家有空研究一下:

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insert into T_cardMenu_851(C_MSISDN,C_CPROFILEID,C_USERLEVEL,C_USERCLASS,C_PARENTID,C_MENUID,C_APPLEN,C_ISLEAF,C_STAT,C_DOWNDATE,C_SYNID,C_BATCHNO,C_MENUNAME) select '8613511981403',c.C_CPROFILEID,c.C_USERLEVEL,c.C_USERCLASS,b.C_PARENTID,b.C_MENUID,length(b.C_BYTECODE)/2,decode(b.C_PARENTID,0,0,1),1,c.C_REGTIME,1,d.C_BATCHNO,b.c_menuname from t_appdefault a,t_menu b,T_userinfo_851 c,t_cardprofile d where c.C_CPROFILEID=a.C_CPROFILEID and c.C_USERLEVEL=a.C_USERLEVEL and c.C_USERCLASS=a.C_USERCLASS and b.C_CPROFILEID=a.C_CPROFILEID and b.C_USERLEVEL=a.C_USERLEVEL and a.C_PARENTID=b.C_PARENTID and a.C_MENUID=b.C_MENUID and b.C_USERCLASS=a.C_USERCLASS and c.C_MSISDN='8613511981403' and a.C_STAT=1 and a.C_DOWNLOAD=1 and d.C_CPROFILEID=c.C_CPROFILEID

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