SQL 練習題

create database lianx
create table student
(

sno char(3) not null primary key,
sname char(8) not null,
ssex char(2),

Sbirthday datetime,
Class varchar(5)
)
insert into student values(108,'曾華',1,'1977-09-01',95033)
insert into student values(105,'匡明',1,'1975-10-02',95031)
insert into student values(107,'王麗',0,'1976-01-23',95033)
insert into student values(101,'李軍',1,'1976-02-20',95033)
insert into student values(109,'王芳',0,'1975-02-10',95031)
insert into student values(103,'陸君',1,'1974-06-03',95031)

select *from student
drop table student

create table course
(
cno char(5) not null primary key ,
cname varchar(10)not null,
tno char(3)not null references teacher(tno)
)
drop table course

insert into course values('3-105','計算機導論',825)
insert into course values('3-245','操做系統',804)
insert into course values('6-166','數字電路',856)
insert into course values('9-888','高等數學',831)
select *from course

create table score
(
sno char(3) not null references student(sno),
cno char(5) not null references course(cno),
degree decimal(4,1)
primary key(sno,cno)
)
insert into score values(103,'3-245',86)
insert into score values(105,'3-245',75)
insert into score values(109,'3-245',68)
insert into score values(103,'3-105',92)
insert into score values(105,'3-105',88)
insert into score values(109,'3-105',76)
insert into score values(101,'3-105',64)
insert into score values(107,'3-105',91)
insert into score values(108,'3-105',78)
insert into score values(101,'6-166',85)
insert into score values(107,'6-166',79)
insert into score values(108,'6-166',81)
select *from score

create table teacher
(
tno char(3) not null primary key,
tname char(4) not null,
tsex char(2) not null,
tbirthday datetime,
prof char(6),
depart varchar(10) not null
)
insert into teacher values(804,'李誠',1,'1958-12-02','副教授','計算機系')
insert into teacher values(856,'張旭',1,'1969-03-12','講師','電子工程系')
insert into teacher values(825,'王萍',0,'1972-05-05','助教','計算機系')
insert into teacher values(831,'劉冰',0,'1977-08-14','助教','電子工程系')

drop table teacher
drop table student
select *from teacher
select *from student select *from teacher select *from course select *from score
drop database lianxi

-- 一、查詢Student表中的全部記錄的Sname、Ssex和Class列。
select sname,ssex,class from student
--二、 查詢教師全部的單位即不重複的Depart列。
select distinct depart from teacher
--三、 查詢Student表的全部記錄。
select *from student
--四、 查詢Score表中成績在60到80之間的全部記錄
select *from score where degree between 60 and 80
--五、 查詢Score表中成績爲85，86或88的記錄。
select *from score where (degree=85 or degree=86 or degree=88)
--六、 查詢Student表中「95031」班或性別爲「女」的同窗記錄。
select *from student where class='95031'or ssex='0'
--七、 以Class降序查詢Student表的全部記錄。
select *from student order by class desc
--八、 以Cno升序、Degree降序查詢Score表的全部記錄
select *from score order by cno asc ,degree desc
--九、 查詢「95031」班的學生人數。
select COUNT(*)from student where class='95031'
--十、 查詢Score表中的最高分的學生學號和課程號。（子查詢或者排序）
select sno,cno,degree from score where degree =(select max(degree) from score)
--十一、 查詢每門課的平均成績。
select AVG(DEGREE) as cno from score group by cno
--十二、查詢Score表中至少有5名學生選修的並以3開頭的課程的平均分數。
select AVG(degree) from score where cno in (select cno from score group by cno having COUNT(*)>=5) and cno like '3%'
select AVG(degree) 平均分 from score where cno like '3%' group by cno having COUNT(*)>=5

--1三、查詢分數大於70，小於90的Sno列。
select cno from score where degree >70 and degree <90
--1四、查詢全部學生的Sname、Cno和Degree列。
select sname,cno,degree from student left join score on student.sno = score .sno
--1五、查詢全部學生的Sno、Cname和Degree列。
select student.sno,cname,degree from student join score on student.sno = score.sno join course on score.cno = course.cno
--1六、查詢全部學生的Sname、Cname和Degree列
select sname,cname,degree from student join score on student.sno = score .sno join course on score .cno = course .cno
-- 1七、查詢「95033」班學生的平均分。
select AVG(DEGREE) as 平均分 from score where degree in
(select degree from score join student on student.sno = score .sno where class='95033')

create table grade(low int,upp int,rank char(1))insert into grade values(90,100,'A')insert into grade values(80,89,'B')insert into grade values(70,79,'C')insert into grade values(60,69,'D')insert into grade values(0,59,'E')--1八、現查詢全部同窗的Sno、Cno和rank列。select sno,cno,[rank] from score ,grade where degree between low and upp --1九、查詢選修「3-105」課程的成績高於「109」號同窗成績的全部同窗的記錄。select degree from score where sno='109' and cno='3-105'select *from student join score on student.sno = score .snowhere cno='3-105' and degree > (select degree from score where sno='109' and cno='3-105')--20、查詢score中選學多門課程的同窗中分數爲非最高分紅績的記錄。--select sno from score group by sno having COUNT(*)>1 --select MAX(degree) from score group by cno select *from score a where sno in (select sno from score group by sno having COUNT(*)>1)and (degree not in (select MAX(degree)from score b where a.cno = b.cno group by cno ))--2一、 查詢成績高於學號爲「109」、課程號爲「3-105」的成績的全部記錄。select *from score where degree >(select degree from score where sno='109' and cno='3-105')--2二、查詢和學號爲108的同窗同年出生的全部學生的Sno、Sname和Sbirthday列。select sno,sname,sbirthday from student where YEAR(sbirthday)=YEAR ((select sbirthday from student where sno='108'))--2三、查詢「張旭「教師任課的學生成績select cno from course where course .tno=(select tno from teacher where tname = '張旭')select degree from score where cno = (select cno from course where course .tno =(select tno from teacher where tname ='張旭'))--2四、查詢選修某課程的同窗人數多於5人的教師姓名。--select cno from score group by cno having COUNT(*)>5--select tno from course where cno =(select cno from score group bu cno having COUNT(*)>5)select tname from teacher where tno =(select tno from course where cno =(select cno from score group by cno having COUNT (*)>5))--2五、查詢95033班和95031班全體學生的記錄。select student.sno,sname,ssex,sbirthday,class,course .cno,degree,cname,teacher.tno,tname,tsex,prof,depart from studentjoin score on student.sno=score .snojoin course on score .cno=course .cnojoin teacher on course .tno=teacher .tnowhere class ='95033' or class ='95031' order by student .sno--2六、 查詢存在有85分以上成績的課程Cno.select distinct cno from score where degree >=85--2七、查詢出「計算機系「教師所教課程的成績表。--select tno from teacher where depart ='計算機系'--select cno from course where tno in (select tno from teacher where depart ='計算機系')select *from score where cno in (select cno from course where tno in (select tno from teacher where depart ='計算機系'))--2八、查詢「計算機系」與「電子工程系「不一樣職稱的教師的Tname和Profselect *from teacher t1 where depart = '計算機系' and not exists (select *from teacher t2 where depart ='電子工程系' and t1.prof = t2.prof)--2九、查詢選修編號爲「3-105「課程且成績至少高於選修編號爲「3-245」的同窗的--Cno、Sno和Degree,並按Degree從高到低次序排序。select cno,sno,degree from score where cno ='3-105' and degree >(select MIN (degree )from score where cno ='3-245') order by degree desc--30、查詢選修編號爲「3-105」且成績高於選修編號爲「3-245」課程的同窗的Cno、Sno和Degree.select cno,sno,degree from score s1 where cno ='3-105' and sno in(select sno from score where cno ='3-245')and degree >(select degree from score s2 where cno ='3-245' and sno in (select sno from score where cno ='3-105')and s1.sno =s2.sno)--3一、 查詢全部教師和同窗的name、sex和birthday.select sname as name ,ssex as sex ,sbirthday as birthday from student unionselect tname ,tsex ,tbirthday from teacher --3二、查詢全部「女」教師和「女」同窗的name、sex和birthday.select sname as name ,ssex as sex,sbirthday as birthday from student where ssex='0'unionselect tname ,tsex ,tbirthday from teacher where tsex = '0'--3三、 查詢成績比該課程平均成績低的同窗的成績表。select *from score where degree <(select AVG (degree ) from score where cno in(select cno from score group by cno))--3四、 查詢全部任課教師的Tname和Depart.select tname ,depart from teacher --35 、 查詢全部未講課的教師的Tname和Depart.--select cno from course where cno not in (select cno from score)select tname ,depart from teacher where tno in (select tno from course where cno =(select cno from course where cno not in (select cno from score )))select tname ,depart from teacher --3六、查詢至少有2名男生的班號。select class from student where ssex ='1' group by class having COUNT(ssex) >=2--3七、查詢Student表中不姓「王」的同窗記錄。select *from student where sname not like '王%'--3八、查詢Student表中每一個學生的姓名和年齡。--(YEAR (DETDATE())-YEAR(sbirthday))select sname,(YEAR(GETDATE())-YEAR(sbirthday)) 年齡 from student --3九、查詢Student表中最大和最小的 Sbirthday日期值。select MAX (sbirthday),MIN(sbirthday)from student --40、以班號和年齡從大到小的順序查詢Student表中的所有記錄。select *from student order by class desc,sbirthday--4一、查詢「男」教師及其所上的課程。--select tname from teacher where tsex='男'--tsex ='男' and course .tno in (select tno from teacher where tsex='男')select tname ,cname from teacher join course on teacher .tno =course .tno where tsex ='1' and course .tno in (select tno from teacher where tsex ='1')--4二、查詢最高分同窗的Sno、Cno和Degree列select sno,cno,degree from score where degree in (select MAX (degree ) from score )--4三、查詢和「李軍」同性別的全部同窗的Sname.select sname from student where ssex =(select ssex from student where sname = '李軍')--4四、查詢和「李軍」同性別並同班的同窗Snameselect sname from student where ssex =(select ssex from student where sname = '李軍')and class =(select class from student where sname = '李軍')--4五、查詢全部選修「計算機導論」課程的「男」同窗的成績表。select *from score where cno in (select cno from course where cname ='計算機導論') and sno in (select sno from student where ssex = '1')