用SQL语句建立第2章习题6的4个表:针对建立的4个表用sql完成第2章习题6的查询

建表语句和插入表转载于:
https://blog.csdn.net/weixin_42545675/article/details/100513076

1创建表

CREATE TABLE S(
SNO CHAR(3) PRIMARY KEY,
SNAME CHAR(10),
STATUS CHAR(2),
CITY CHAR(10));
 
CREATE TABLE P(
PNO CHAR(3),
PNAME CHAR(10),
COLOR CHAR(4),
WEIGHT INT,
PRIMARY KEY(PNO));
 
CREATE TABLE J(
JNO CHAR(3),
JNAME CHAR(10),
CITY CHAR(10),
PRIMARY KEY(JNO));
 
CREATE TABLE SPJ(
SNO CHAR(3),
PNO CHAR(3),
JNO CHAR(3),
QTY INT,
PRIMARY KEY(SNO,PNO,JNO),
FOREIGN KEY(SNO) REFERENCES S(SNO),
FOREIGN KEY(PNO) REFERENCES P(PNO),
FOREIGN KEY(JNO) REFERENCES J(JNO)
);

2插入表

INSERT
INTO S(SNO,SNAME,STATUS,CITY)
VALUES('S1','精益','20','天津');
INSERT
INTO S
VALUES('S2','盛锡','10','北京');
INSERT
INTO S
VALUES('S3','东方红','30','北京');
INSERT
INTO S
VALUES('S4','丰泰盛','20','天津');
INSERT
INTO S
VALUES('S5','为民','30','上海');

INSERT
INTO P
VALUES('P1','螺母','红',12);
INSERT
INTO P
VALUES('P2','螺栓','绿',17);
INSERT
INTO P
VALUES('P3','螺丝刀','蓝',14);
INSERT
INTO P
VALUES('P4','螺丝刀','红',14);
INSERT
INTO P
VALUES('P5','凸轮','蓝',40);
INSERT
INTO P
VALUES('P6','齿轮','红',30);

INSERT
INTO J
VALUES('J1','三建','北京');
INSERT
INTO J
VALUES('J2','一汽','长春');
INSERT
INTO J
VALUES('J3','弹簧厂','天津');
INSERT
INTO J
VALUES('J4','造船厂','天津');
INSERT
INTO J
VALUES('J5','机车厂','唐山');
INSERT
INTO J
VALUES('J6','无限电厂','常州');
INSERT
INTO J
VALUES('J7','半导体厂','南京');

INSERT INTO SPJ VALUES('S1','P1','J1',200);
INSERT INTO SPJ VALUES('S1','P1','J3',100);
INSERT INTO SPJ VALUES('S1','P1','J4',700);
INSERT INTO SPJ VALUES('S1','P2','J2',100); 
INSERT INTO SPJ VALUES('S2','P3','J1',400);
INSERT INTO SPJ VALUES('S2','P3','J2',200);
INSERT INTO SPJ VALUES('S2','P3','J4',500);
INSERT INTO SPJ VALUES('S2','P3','J5',400);
INSERT INTO SPJ VALUES('S2','P5','J1',400);
INSERT INTO SPJ VALUES('S2','P5','J2',100);
INSERT INTO SPJ VALUES('S3','P1','J1',200);
INSERT INTO SPJ VALUES('S3','P3','J1',200);
INSERT INTO SPJ VALUES('S4','P5','J1',100);
INSERT INTO SPJ VALUES('S4','P6','J3',300);
INSERT INTO SPJ VALUES('S4','P6','J4',200);
INSERT INTO SPJ VALUES('S5','P2','J4',100);
INSERT INTO SPJ VALUES('S5','P3','J1',200);
INSERT INTO SPJ VALUES('S5','P6','J2',200);
INSERT INTO SPJ VALUES('S5','P6','J4',500);

3第三章第4题

1求供应工程J1零件的供应商号码SNO

select distinct sno
from spj
where jno='J1';

2求供应工程J1零件p1的供应商号码SNO

select distinct  sno
from spj
where jno='J1' and pno='P1';

3求供应工程J1零件为红色的供应商号码SNO

嵌套查询
select sno
from spj
where jno='j1'
	and pno in   /*找出红色的零件号码pno*/
	(select pno
	from p  /*从p表中找*/
	where color='红');
	
或 用连接查询
select sno
from spj,p
where p.pno = spj.pno and -- 连接两个表
	jno='J1' and  p.color='红';

4求没有使用天津供应商生产的红色零件的工程号

工程表J中不包含: 1和2为嵌套关系
	1天津的供应商生产的
	2红色的零件
	 

select jno
from j -- 从j表入手,以包含那些尚未使用任何零件的工程号
where not exists
	(select *
	from spj
	where spj.jno = j.jno 
	  and sno in
		(select sno -- 天津供应商的sno
		from s
		where city='天津')
	 and pno in
	 	(select pno -- 红色零件的pno
	 	from p
	 	where color='红'));
或			
select Jno
from j
where not exists
	(select *
	from spj,s,p
	where spj.sno =s.sno and spj.jno = j.jno  
		and spj.pno = p.pno -- 两个and,三个等于用于,连接三个表
		and s.city = '天津' 
		and p.color = '红');


	
	

5求至少用了供应商s1所供应的全部零件的的工程号JNO

select distinct jno
from spj spjz
where not exists  -- 这是一个相关子查询
	(select * -- 父查询和子查询均引用了spj表
	from spj spjx -- 用别名spjz,spjx将父查询与子查询分开
	where sno='s1'
	and not exists
		(select *  -- 用别名spjy与父查询中spj表分开
		from spj spjy
		where spjy.pno = spjx.pno
			and spjy.jno = spjz.jno));


select * -- 父查询和子查询均引用了spj表
	from spj spjx -- 用别名spjz,spjx将父查询与子查询分开
	where sno='s1'
	and not exists
		(select *  -- 用别名spjy与父查询中spj表分开
		from spj spjy
		where spjy.pno = spjx.pno); -- 查询结果为0

会循环显示sno不是s1的项目
select *
from spj spjx ,spj spjy -- 用别名spjz,spjx将父查询与子查询分开
where not spjx.sno='s1' and  not spjy.pno = spjx.pno;
	

4第三章第5题

1找出所有供应商的姓名和所在城市

select Sname,city
from s

2找出所有零件的名称,颜色,重量

select Pname,color,weight
from p;

3找出使用供应商s1所供应零件的工程号码

select jno
from spj
where sno='s1';

4找出工程项目j2使用的各种零件的名称及其数量

select Pname,QTy
from spj,p
where spj.pno = p.pno 	
	and spj.jno='j2';

5找出上海厂商供应的所有零件号码

select distinct Pno
from spj
where sno in
	(select sno
	from s
	where  s.city='上海');

select distinct pno
from s,spj
where spj.sno=s.sno 
	and s.city='上海';

6找出使用上海产的零件的工程名字

select Jname
from j
where jno in
	(select jno
	from s,spj
	where s.sno=spj.sno
	and s.city='上海');
或
select jname
from j,s,spj
where j.jno=spj.jno and s.sno=spj.sno
	and where s.city='上海');

7找出没有使用天津产的零件的工程号

select jno
from j
where not exists
	(select *
	from spj
	where spj.jno=j.jno
		and sno in
			(select sno
			from s
			where  1=1	/*s.sno=spj.sno 可有可无*/
			and city='天津'));
或
select jno
from j
where not exists
	(select *
	from spj,s
	where spj.jno=j.jno 
		and spj.sno=s.sno
		and s.city='天津');

8把全部红色零件的颜色改为蓝色

update	p
set color='蓝'
where color='红';

9由s5供给j4的零件p6改为由s3供应

update	spj
set sno='s3'
where sno='s5' and jno='j4' and pno='p6';

10从供应商关系删除s2的记录,并从供应关系中删除相应的记录

先删spj表中的内容
再删s表中的内容 
因为spj表依赖s表

delete from spj where sno='s2';
delete from s where sno='s2';

11请将(s2,j6,p4,200)插入供应情况关系

insert into spj
values('s2','j6','p4',200);