数据库sql中S P J SPJ 表的创建

创建s，p，j，spj表

CREATE TABLE S
(
SNO VARCHAR2(10),
SNAME VARCHAR2(10) NOT NULL,
STATUS VARCHAR2(3),
CITY VARCHAR2(20),
CONSTRAINT PK_S PRIMARY KEY(SNO)
);
CREATE TABLE P
(
PNO VARCHAR2(10),
PNAME VARCHAR2(20) NOT NULL,
COLOR VARCHAR(10),
WEIGHT VARCHAR(2),
CONSTRAINT PK_P PRIMARY KEY(PNO)
);
CREATE TABLE J
(
JNO VARCHAR2(10),
JNAME VARCHAR2(20) NOT NULL,
CITY VARCHAR(20),
CONSTRAINT PK_J PRIMARY KEY(JNO)
);
CREATE TABLE SPJ
(
SNO VARCHAR2(10),
PNO VARCHAR2(10),
JNO VARCHAR2(10),
QTY NUMBER(3),
CONSTRAINT PK_SPJ PRIMARY KEY(SNO,PNO,JNO)，
CONSTRAINT FK_SPJ_To_S FOREIGN KEY (SNO) REFERENCES S(SNO),
CONSTRAINT FK_SPJ_To_P FOREIGN KEY (PNO) REFERENCES P(PNO),
CONSTRAINT FK_SPJ_To_J FOREIGN KEY (JNO) REFERENCES J(JNO)
);

插入相关元素

INSERT INTO S 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','无线电厂','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);

方便接下来实验直接配置当前的表进行查询！

alter table p rename column sname to pname;

select sname,city from s;

select pname,color,weight from p;

select PNAME,QTY
  from p,spj
  where spj.jno='J2'and p.pno=spj.pno;

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


select jname
 from s,spj,j
 where s.city='上海' and s.sno=spj.sno and j.jno=spj.jno;


select jno 
 from s,spj
 where city!='天津' and s.sno=spj.sno;


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

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

select sno
 from p,spj
 where color='红'and p.pno=spj.pno;
///1
select spj.sno sno
from s,p,spj
 where not(s.city='天津'and p.color='红')and s.sno=spj.sno and p.pno=spj.pno;

select sno from spj
minus
select spj.sno sno
from s,p,spj
 where s.city='天津'and p.color='红'and s.sno=spj.sno and p.pno=spj.pno;
///2
select sno
foom spj
where sno in
         (select sno
           from s
          where city