sqlserver怎么写,sql server如何写代码

sqlserver怎样写查询语句完成下面的运算

将两条查询语句作为子查询的一部分连表.

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select t1.count1+t2.count2 as 'countSum',t1.branch

(select count as count1, branch from table1 group by branch)t1

(select count as count2, branch from table2 group by branch)t2 on t1.branch =t2.branch

这种写法有一个潜在的限制,t1中的branch 必须包含t2,所以你的需求一般这么写:

select sum(counts)counts,branch

from(select * from(select count as counts, branch from table1 group by branch)t1

union

select * from(select count as counts, branch from table2 group by branch )t1)t

group by branch

----新建登录角色用户：

use master

exec sp_addlogin 'lx','123',['pubs']--新建登录lx,密码123, [默认数据库pubs]

use pubs

exec sp_grantdbaccess 'lx','slx'--为pubs添加一个用户(角色为public)

exec sp_addrolemember db_owner ,slx--将slx添加到db_owner角色组

# 注：可合并做一步 :

use pubs

exec sp_adduser lx,slx,db_owner

----------另外可以搞一个sa这样的牛逼账户，权限很高，你自己测试吧

exec sp_addsrvrolemember 'lx','sysadmin'--以sa登录执行，添加登录lx到system administrators中

嵌套比较多，你慢慢看。

select D.address, D.time, D.value

from (select A.address, A.time, A.value

from A

union

select B.address, B.time, B.value

from B) D,

(select C.Address, max(C.time) as maxTime

from (select A.address, A.time, A.value

from A

union

select B.address, B.time, B.value

from B) C

group by C.address) E

where D.address = E.address

and D.time = E.maxTime

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