数据库的知识忘干净了

------------------------------------第一题--------------------------
DROP TABLE TB
DROP TABLE TA
create table TA
(
    IDKey    int    primary key,
    [Name]    varchar(20),
    [Type]    varchar(20)
)
create table TB
(
    DKey    int    primary key,
    IDKey    int    references TA(IDKey),
    [count]    int,
)
insert into TA values(1,‘aaa‘,‘类型一‘)
insert into TA values(2,‘bbb‘,‘类型二‘)
insert into TA values(3,‘ccc‘,‘类型三‘)

insert into TB values(1,1,300)
insert into TB values(2,1,421)
insert into TB values(3,2,124)
insert into TB values(4,1,415)

DELETE TB WHERE IDKey IN (SELECT IDKey FROM TA WHERE [Type]=‘类型一‘)
------------------------------------第二题--------------------------
create table TC
(
    Guest    int    ,
    [name]    varchar(20),
    je        int,
)
insert into TC values(1,‘张三‘,1000)
insert into TC values(2,‘李四‘,4000)
insert into TC values(3,‘李四‘,3000)
insert into TC values(4,‘王武‘,1000)
insert into TC values(5,‘王武‘,2000)
insert into TC values(6,‘李四‘,3000)
insert into TC values(7,‘王武‘,2000)

select [name] as 姓名, count([name]) as 消费次数,sum(je) as 消费金额 from 
TC group by [name] having count([name])>2  order by sum(je) desc


------------------------------------第三题--------------------------
drop table SC
drop table S
drop table C
create table S
(
    s# INT PRIMARY KEY IDENTITY,
    sn varchar(20),
    sd    varchar(20),
    sa    int
)
insert into S values(‘张三‘,‘武软‘,20)
insert into S values(‘李四‘,‘武职‘,10)
insert into S values(‘王武‘,‘武软‘,18)
insert into S values(‘赵六‘,‘武软‘,18)

create table C
(
    c# VARCHAR(20) PRIMARY KEY,
    cn varchar(20),
)
insert into C values(‘C1‘,‘税收基础‘)
insert into C values(‘C2‘,‘JAVA‘)
insert into C values(‘C3‘,‘SQL SERVER‘)
insert into C values(‘C4‘,‘语文‘)
insert into C values(‘C5‘,‘数学‘)

create table SC
(
    S# INT REFERENCES S(s#),
    C# VARCHAR(20) REFERENCES C(c#),
    G    INT
)
insert into SC values(1,‘C1‘,90)
insert into SC values(1,‘C2‘,100)
insert into SC values(1,‘C3‘,90)
insert into SC values(2,‘C2‘,100)
insert into SC values(3,‘C3‘,90)

--1
select s# 学号,sn 姓名 from s where S# in (select S# from SC where C# in (select c# from C where cn=‘税收基础‘))
--2
select sn 姓名,sd 单位 from S where s# in (select s# from SC where C#=‘C2‘)
--3
select sn 姓名,sd 单位 from S where s# in (select s# from SC where C#<>‘C5‘)
--4
select ‘选修了课程的学员人数为‘=COUNT(*) from S WHERE S# IN (select count(S#) from SC group by S#)
--5
select sn 姓名,sd 单位 from S where s# in (select S# from SC group by  S# having S#>5)
--6
-----------------------------------------------------------------------------------------
select sn 姓名,sd 单位 from S where s# in (select s# from SC where C# in (‘C1‘,‘C2‘,‘C3‘))



------------------------------------第四题--------------------------
create table TD 
(
    sfish char(6) primary key,
    je      money,
    jsfs    varchar(20),
    xj      money
)
insert into TD values (‘NO001‘,150,‘现金‘,150)
insert into TD values (‘NO002‘,150,‘刷卡‘,0)
insert into TD values (‘NO003‘,150,‘刷卡‘,150)
insert into TD values (‘NO004‘,150,‘支票‘,0)

select sum(je) from TD --总金额

select ‘现金‘= SUM(xj),
‘刷卡‘=sum(je)- SUM(xj)-(select sum(je) from TD group by jsfs having jsfs=‘支票‘),
‘支票‘=(select sum(je) from TD group by jsfs having jsfs=‘支票‘),
‘总金额‘=sum(je) from TD