sqlserver3,sqlserver3707

无法启动sql server(mssqlserver)服务 错误3:系统找不到指定的路径

解决方案

既然知道了问题所在，那么久好解决了。找到SQL SERVER安装路径，Binn目录下，找到这个文件：

右键用超级管理员账户运行，就可以发现Sql server提供服务了！

sqlserverstart

虽然运行成功了，但是总不能每次去运行吧。所以我再写一段批处理，保存为bat文件运行即可。批处理内容：

@echo off

SC CREATE mssqlserver binPath= "D:\Program Files\Microsoft SQL Server\MSSQL10.MSSQLSERVER\MSSQL\Binn\sqlservr.exe" DisplayName= "SQL Server" start= auto

REG ADD HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\mssqlserver /v Description /t REG_SZ /d "用于提供SQL SERVER服务的服务，如果停止，则无法提供SQL SERVER服务。"

NET START mssqlserver

注意：以上代码中路径部分，请修改为本机Sqlserver安装路径。

sqlserver三表联查sql语句

假设学生表叫student,课程表叫class,选课表叫choose

1.三层嵌套的问题

select student.name from student where student.id IN

(select choose.sid from choose where choose.cid NOT IN

(select class.id from class where class.teacher='李明'))

2.一个内连接，一个嵌套

select student.name,avg(choose.score) from

student inner join choose on student.id=choose.sid

where student.id IN

(select choose.sid from choose

where choose.score'60'

group by choose.sid

having count(choose.sid)=2)

gruop by student.id

3.一个联合查询，一个嵌套查询

select student.name from student

where student.id IN

(select c1.sid from choose c1 where choose.cid='1'

union

select c2.sid from choose c2 where choose.cid='2'

on c1.sid=c2.sid

)

4.其实就是自连接查询和行列交换的问题：

select student.id,

(case choose.id when '1' then choose.score end) as 1号课成绩,

(case choose.id when '2' then choose.score end) as 2号课成绩,

from student inner join choose on student.id=choose.sid sc1,

student inner join choose on student.id=choose.sid sc2

where sc1.id='1'

and sc2.id='2'

and sc1.scoresc2.score

关于.asp中的sqlserver3张表的多表查询

具体要查哪个字段，你自己修改吧，我帮你把表之间的链接条件写出来。

select a.*, b.*, c.* from a, b, c where a.a1 = b.b1 and a.a2 = c.c2 and a2 = an