标签:INSERT INTO SPJ J1 char 关系数据库 VALUES 课后 习题
3.有两个关系S(A,B,C,D)和T(C,D,E,F),写出与下列查询等价的SQL表达式
答:
(1)
select *
from S
where A=10;
(2)
select A,B
from S;
(3)
select A,B,C,D,E,F
from S,T
where S.c=T.c AND S.d=T.d
(4)
select *
from S,T
where S.c=T.c
(5)
select *
from S,T
where A < E
(6)
select
from (select C,D from S) as S1,T;
4.用SQL语句建立第2章习题6中的4个表;针对建立的4个表用SQL完成第二章习题6中的查询
答:
建表:
CREATE TABLE S(SNO char(2),
SNAME char(10),
STATUS smallint,
CITY char(10))
CREATE TABLE P(PNO char(2),
PNAME char(10),
COLOR char(2),
WEIGHT smallint)
CREATE TABLE J(JNO char(2),
JNAME char(10),
CITY char(10))
CREATE TABLE SPJ(SNO char(2),
PNO char(2),
JNO char(2),
QTY smallint)
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',20,'北京');
INSERT
INTO S
VALUES ('S4','丰泰盛',20,'天津');
INSERT
INTO S
VALUES ('S5','为民',20,'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);
最近课有点多,事情也比较多,题目没做完,明天补上
标签:INSERT,INTO,SPJ,J1,char,关系数据库,VALUES,课后,习题 来源: https://blog.csdn.net/ChrisKevin0221/article/details/115768763
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