sql-server不相關子查詢

一個勤勤懇懇的q大炮發表於2020-12-29

不相關子查詢

--下面題用不相關子查詢做。
--1．	查詢與張爽老師在同一個系工作的老師。
select * from T where T.name!='張爽' and T.department=(
select T.department from T where T.name='張爽')
--2．	查詢選修了資料結構課程的學生的學號和姓名。
select Sid,sname from S where Sid in(
  select Sid from SC where SC.Cid=(
     select Cid from C where C.cname='資料結構'))
--3．	查詢選修了Java語言課程的學生姓名。
select sname from S where Sid in(
  select Sid from SC where SC.Cid=(
     select Cid from C where C.cname='Java語言'))
--4．	查詢江西學生的平均成績。
select AVG(score) from SC where Sid in(
select Sid from S where S.nativeplace like '江西%')
--5．	查詢選修了103號課程，且成績高於該課程平均分數的學生資訊。
select * from S where S.Sid=(
  select Sid from SC where SC.Cid='103' and score>(
    select AVG(score) from SC where SC.Cid='103'))
--6．	查詢沒有選修Java語言的學生姓名。
select * from S where Sid not in(
  select Sid from SC where SC.Cid=(
     select Cid from C where C.cname='Java語言'))
select * from S 
except
select * from S where Sid in(
  select Sid from SC where SC.Cid=(
     select Cid from C where C.cname='Java語言'))
--7．	查詢比江西省所有學生年齡都小的其他省的學生的學號和姓名。
select * from S where S.nativeplace not like '江西%' and age<all(
select age from S where S.nativeplace like '江西%')
select * from S where S.nativeplace not like '江西%' and age<(
select min(age) from S where S.nativeplace like '江西%')

資料表
create database jxgl
go
use jxgl
go
create table T(
Tid nchar(5) primary key,
name nchar(10) not null,
sex nchar(2) default '男',
workingtime	datetime,
plandscape nchar(20),
degree nchar(10),
title nvarchar(6),
department nvarchar(20),
tel	nchar(11)
)

create table S(
Sid	nchar(10) primary key,
sname nchar(10),	
sex	nchar(2) default '男',
birthday Date,	
age	as datediff(yy,birthday,getdate()),	
entrydate date,	
plandscape nchar(10) default '團員',
nativeplace	nvarchar(20),	
class as substring(Sid,7,2)
)

create table C(
Cid	nchar(3) primary key,
cname nvarchar(20) Not null,
category nchar(4) Not null check(category in('考試','考查')) default '考試',
credit	int,
Tid	nchar(5) foreign key references T(Tid) on update cascade
)

create table SC(
Sid	nchar(10) foreign key references S(Sid) on update cascade on delete cascade,
Cid	nchar(3),
score int check(score between 0 and 100),
primary key(Sid,Cid),
foreign key(Cid) references C(Cid) on update cascade on delete cascade
)

INSERT [dbo].[T] ([Tid], [name], [sex], [workingtime], [plandscape], [degree], [title], [department], [tel]) VALUES (N'95011', N'趙西明       ', N'男 ', CAST(0x0000768300000000 AS DateTime), N'群眾                  ', N'碩士        ', N'副教授', N'軟體', N'13733152369')
INSERT [dbo].[T] ([Tid], [name], [sex], [workingtime], [plandscape], [degree], [title], [department], [tel]) VALUES (N'95012', N'李小平       ', N'男 ', CAST(0x0000775E00000000 AS DateTime), N'黨員                  ', N'碩士        ', N'教授', N'計算機系', N'13733152370')
INSERT [dbo].[T] ([Tid], [name], [sex], [workingtime], [plandscape], [degree], [title], [department], [tel]) VALUES (N'95013', N'張爽        ', N'男 ', CAST(0x00007BC700000000 AS DateTime), N'群眾                  ', N'本科        ', N'副教授', N'計算機系', N'13733152371')
INSERT [dbo].[T] ([Tid], [name], [sex], [workingtime], [plandscape], [degree], [title], [department], [tel]) VALUES (N'95014', N'李麗寧       ', N'女 ', CAST(0x00007BC700000000 AS DateTime), N'黨員                  ', N'碩士        ', N'副教授', N'計算機系', N'13733152372')
INSERT [dbo].[T] ([Tid], [name], [sex], [workingtime], [plandscape], [degree], [title], [department], [tel]) VALUES (N'95015', N'張金明       ', N'男 ', CAST(0x0000812C00000000 AS DateTime), N'群眾                  ', N'碩士        ', N'講師', N'計算機系', N'13733152373')
INSERT [dbo].[T] ([Tid], [name], [sex], [workingtime], [plandscape], [degree], [title], [department], [tel]) VALUES (N'95016', N'李燕        ', N'女 ', CAST(0x000082C800000000 AS DateTime), N'黨員                  ', N'碩士        ', N'講師', N'計算機系', N'13733152374')
INSERT [dbo].[T] ([Tid], [name], [sex], [workingtime], [plandscape], [degree], [title], [department], [tel]) VALUES (N'95017', N'宛平        ', N'女 ', CAST(0x0000840B00000000 AS DateTime), N'群眾                  ', N'博士        ', N'副教授', N'軟體', N'13733152375')
INSERT [dbo].[T] ([Tid], [name], [sex], [workingtime], [plandscape], [degree], [title], [department], [tel]) VALUES (N'95018', N'陳江川       ', N'男 ', CAST(0x0000883900000000 AS DateTime), N'群眾                  ', N'博士        ', N'講師', N'軟體', N'13733152376')
INSERT [dbo].[T] ([Tid], [name], [sex], [workingtime], [plandscape], [degree], [title], [department], [tel]) VALUES (N'95019', N'郭新        ', N'男 ', CAST(0x00008CAA00000000 AS DateTime), N'黨員                  ', N'博士        ', N'講師', N'軟體', N'13733152377')
INSERT [dbo].[S] ([Sid], [sname], [sex], [birthday], [entrydate], [plandscape], [nativeplace]) VALUES (N'2017071101', N'張佳        ', N'女 ', CAST(0x3F1D0B00 AS Date), CAST(0x3C3D0B00 AS Date), N'團員        ', N'江西南昌')
INSERT [dbo].[S] ([Sid], [sname], [sex], [birthday], [entrydate], [plandscape], [nativeplace]) VALUES (N'2017071102', N'好生        ', N'男 ', CAST(0xCD1E0B00 AS Date), CAST(0x3C3D0B00 AS Date), N'團員        ', N'廣州順德')
INSERT [dbo].[S] ([Sid], [sname], [sex], [birthday], [entrydate], [plandscape], [nativeplace]) VALUES (N'2017071203', N'徐克        ', N'男 ', CAST(0xBF210B00 AS Date), CAST(0x3C3D0B00 AS Date), N'團員        ', N'江西南昌')
INSERT [dbo].[S] ([Sid], [sname], [sex], [birthday], [entrydate], [plandscape], [nativeplace]) VALUES (N'2017071204', N'葉飛        ', N'女 ', CAST(0xD1210B00 AS Date), CAST(0x3C3D0B00 AS Date), N'黨員        ', N'上海')
INSERT [dbo].[S] ([Sid], [sname], [sex], [birthday], [entrydate], [plandscape], [nativeplace]) VALUES (N'2017071205', N'任偉        ', N'男 ', CAST(0x7B220B00 AS Date), CAST(0x3C3D0B00 AS Date), N'團員        ', N'北京順義')
INSERT [dbo].[S] ([Sid], [sname], [sex], [birthday], [entrydate], [plandscape], [nativeplace]) VALUES (N'2017071206', N'江賀        ', N'男 ', CAST(0x02200B00 AS Date), CAST(0x3D3D0B00 AS Date), N'黨員        ', N'福建廈門')
INSERT [dbo].[C] ([Cid], [cname], [category], [credit], [Tid]) VALUES (N'101', N'計算機基礎', N'考試  ', 2, N'95011')
INSERT [dbo].[C] ([Cid], [cname], [category], [credit], [Tid]) VALUES (N'102', N'C語言', N'考試  ', 3, N'95012')
INSERT [dbo].[C] ([Cid], [cname], [category], [credit], [Tid]) VALUES (N'103', N'計算機組成原理', N'考試  ', 3, N'95012')
INSERT [dbo].[C] ([Cid], [cname], [category], [credit], [Tid]) VALUES (N'104', N'組合語言', N'考試  ', 3, N'95014')
INSERT [dbo].[C] ([Cid], [cname], [category], [credit], [Tid]) VALUES (N'105', N'Java語言', N'考查  ', 2, N'95015')
INSERT [dbo].[C] ([Cid], [cname], [category], [credit], [Tid]) VALUES (N'106', N'作業系統', N'考試  ', 3, N'95016')
INSERT [dbo].[C] ([Cid], [cname], [category], [credit], [Tid]) VALUES (N'107', N'資料結構', N'考試  ', 3, N'95017')
INSERT [dbo].[C] ([Cid], [cname], [category], [credit], [Tid]) VALUES (N'108', N'編譯原理', N'考試  ', 3, N'95017')
INSERT [dbo].[C] ([Cid], [cname], [category], [credit], [Tid]) VALUES (N'109', N'網路基礎', N'考試  ', 3, N'95017')
INSERT [dbo].[C] ([Cid], [cname], [category], [credit], [Tid]) VALUES (N'110', N'資料庫原理', N'考試  ', 3, N'95017')
INSERT [dbo].[C] ([Cid], [cname], [category], [credit], [Tid]) VALUES (N'120', N'SQLServer', N'考查  ', 2, N'95018')
INSERT [dbo].[SC] ([Sid], [Cid], [score]) VALUES (N'2017071101', N'101', 90)
INSERT [dbo].[SC] ([Sid], [Cid], [score]) VALUES (N'2017071101', N'102', 70)
INSERT [dbo].[SC] ([Sid], [Cid], [score]) VALUES (N'2017071101', N'103', 48)
INSERT [dbo].[SC] ([Sid], [Cid], [score]) VALUES (N'2017071101', N'105', 80)
INSERT [dbo].[SC] ([Sid], [Cid], [score]) VALUES (N'2017071102', N'102', 90)
INSERT [dbo].[SC] ([Sid], [Cid], [score]) VALUES (N'2017071102', N'104', 77)
INSERT [dbo].[SC] ([Sid], [Cid], [score]) VALUES (N'2017071102', N'106', 68)
INSERT [dbo].[SC] ([Sid], [Cid], [score]) VALUES (N'2017071102', N'107', 85)
INSERT [dbo].[SC] ([Sid], [Cid], [score]) VALUES (N'2017071102', N'109', 77)
INSERT [dbo].[SC] ([Sid], [Cid], [score]) VALUES (N'2017071102', N'110', 65)
INSERT [dbo].[SC] ([Sid], [Cid], [score]) VALUES (N'2017071102', N'120', 48)
INSERT [dbo].[SC] ([Sid], [Cid], [score]) VALUES (N'2017071203', N'102', 65)
INSERT [dbo].[SC] ([Sid], [Cid], [score]) VALUES (N'2017071203', N'104', 82)
INSERT [dbo].[SC] ([Sid], [Cid], [score]) VALUES (N'2017071203', N'105', 79)
INSERT [dbo].[SC] ([Sid], [Cid], [score]) VALUES (N'2017071203', N'107', 55)
INSERT [dbo].[SC] ([Sid], [Cid], [score]) VALUES (N'2017071203', N'110', 77)
INSERT [dbo].[SC] ([Sid], [Cid], [score]) VALUES (N'2017071203', N'120', 67)
INSERT [dbo].[SC] ([Sid], [Cid], [score]) VALUES (N'2017071204', N'101', 86)
INSERT [dbo].[SC] ([Sid], [Cid], [score]) VALUES (N'2017071204', N'102', 86)
INSERT [dbo].[SC] ([Sid], [Cid], [score]) VALUES (N'2017071204', N'104', 77)
INSERT [dbo].[SC] ([Sid], [Cid], [score]) VALUES (N'2017071204', N'105', 84)
INSERT [dbo].[SC] ([Sid], [Cid], [score]) VALUES (N'2017071204', N'106', 95)
INSERT [dbo].[SC] ([Sid], [Cid], [score]) VALUES (N'2017071204', N'108', 91)
INSERT [dbo].[SC] ([Sid], [Cid], [score]) VALUES (N'2017071204', N'110', 82)
INSERT [dbo].[SC] ([Sid], [Cid], [score]) VALUES (N'2017071205', N'101', 63)
INSERT [dbo].[SC] ([Sid], [Cid], [score]) VALUES (N'2017071205', N'102', 84)
INSERT [dbo].[SC] ([Sid], [Cid], [score]) VALUES (N'2017071205', N'103', 77)
INSERT [dbo].[SC] ([Sid], [Cid], [score]) VALUES (N'2017071206', N'107', 58)
INSERT [dbo].[SC] ([Sid], [Cid], [score]) VALUES (N'2017071206', N'108', 74)
INSERT [dbo].[SC] ([Sid], [Cid], [score]) VALUES (N'2017071206', N'109', 74)

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