create table Student(Sname varchar(10),Ssex varchar(5),Sage int,S# int)
insert into Student
select '夏亮','男','21','1004'
select '成平','男','20','1001' union all
select '王波','男','19','1002' union all
select '突然','女','19','1003'
create table Course(C# varchar(10),Cname varchar(10),T# varchar(10))
insert into Course
select '006','化学','C06' union all
select '005','数学','C06' union all
select '004','地理','C05' union all
select '001','自然','C02' union all
select '002','社会','C01' union all
select '003','心理','C03'
IF EXISTS (SELECT 1 from SC)
DROP TABLE SC
GO
create table SC(S# int,C# varchar(10),score int)
insert into SC
select '1004','002',13 union all
select '1004','004',13 union all
select '1004','005',13 union all
select '1004','006',13 union all
select '1004','001',13 union all
select '1004','003',35 union all
select '1003','002',95 union all
select '1003','001',55 union all
select '1001','006',55 union all
select '1001','005',100 union all
select '1001','001',100 union all
select '1002','001',null union all
select '1001','002',90 union all
select '1003','003',68
create table Teacher(T# varchar(10),Tname varchar(10))
insert into Teacher
select 'C04','天里浩'union all
select 'C05','天任浩'union all
select 'C03','立小丽'union all
select 'C02','朱列夫'union all
select 'C01','天任浩'union all
select 'C04','天里浩'union all
select 'C06','叶平'
select * from Course
select * from SC
select * from student
--Student(S#,Sname,Sage,Ssex) 学生表
--Course(C#,Cname,T#) 课程表
--SC(S#,C#,score) 成绩表
--Teacher(T#,Tname) 教师表
--问题：
--1、查询“”课程比“”课程成绩高的所有学生的学号:
select distinct S# from SC as sc where
(select score from sc as sc1 where c#='001' and sc1.s#=sc.s#)>
(select score from sc as sc2 where c#='002' and sc2.s#=sc.s#)
select S# from SC s where C#='001' and score
SQL Server在msdb数据中维护了一系列表，用来存储执行所有备份和还原的细节信息。即使你正在使用第三方的备份应用程序，只要这个应用程序使用SQL Server的虚拟设备接口(Virtual Device Interface---VDI)来执行备份和还原执行，那么执行细节依然被存储在这一系列表中。
存储细节的表包括：
backupset
backupfile&n ......
