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。
4.用SQL语句建四个表,完成查询:
(1)查询供应J1零件的SNO
(2)查询供应J1零件P1的供应商号码SNO
(3)供应工程J1零件为红色的供应商号码SNO
(4)没有使用天津供应商生产的红色零件的工
程号JNO
(5)至少用了S1供应的全部零件的工程号JNO
5.在建立的四个表中,完成以下查询。
(1)找出所有供应商的姓名和所在城市
(2)找出所有零件的名称,颜色,重量
(3)找出使用供应商S1所供应零件的工程号码
(4)找出工程项目J2使用的各种零件的
名称及其数量
(5)找出上海厂商供应的所有零件号码
(6)找出使用上海产的零件的工程名称
(7)找出没有使用天津产的零件的工程号码
(8)把全部红色零件的颜色改为蓝色
(9)由S5供给J4的零件P6改为由S3供应,
请做必要的修改
(10)从供应商关系中删除S2的记录,并从供
应情况关系中删除相应的记录
(11)请将(S2,J6,P4,200)插入供应
情况关系
9.请为三建工程项目建立一个供应情况的视图,包括供应商代码(SNO),零件代码(PNO),供应数量(QTY)。针对该视图完成下列查询: (1)找出三建工程项目使用的各种零件代码及其数量 (2)找出供应商S1的供应情况**
SELECT *
FROM S
WHERE A=10;
SELECT A,B
FROM S;
SELECT *
FROM S,T
WHERE S.C=T.C AND S.D=T.D;
SELECT *
FROM S,T
WHERE S.C=T.C;
SELECT *
FROM S,T
WHERE S.A<S.E;
SELECT *
FROM S,T
WHERE S.C=T.C AND T.D=S.D;
首先建表
CREATE TABLE S
( SNO CHAR(2) UNIQUE,
SNAME CHAR(6),
STATUS CHAR(2),
CITY CHAR(4));
CREATE TABLE J
(JNO CHAR(2),
JNAME CHAR(8),
CITY CHAR(4)
);
CREATE TABLE P
(PNO CHAR(2) UNIQUE,
PNAME CHAR(6),
COLOR CHAR(2),
WEIGHT INT
);
CREATE TABLE SPJ
(SNO CHAR(2),
PNO CHAR(2),
JNO CHAR(2),
QTY INT);
插入数据
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);
SELECT SNO
FROM SPJ
WHERE JNO='J1';
SELECT SNO
FROM SPJ
WHERE JNO='J1' AND PNO='P1';
SELECT SNO
FROM SPJ,P
WHERE JNO='J1'AND SPJ.PNO=P.PNO AND COLOR='红';
SELECT JNO
FROM SPJ
WHERE JNO NOT IN(SELECT JNO
FROM SPJ,P,S
WHERE S.CITY='天津' AND COLOR='红' AND S.SNO=SPJ.SNO AND P.PNO=SPJ.PNO);
SELECT DISTINCT PNO
FROM SPJ
WHERE SNO='S1';
SELECT JNO
FROM SPJ
WHERE PNO='P1' AND JNO IN (SELECT JNO
FROM SPJ
WHERE PNO='P2');
[注意]:先查询S1供应的零件号(可以得出是P1和P2),再查询两者均使用的工程号
SELECT SNAME,CITY
FROM S;
SELECT PNAME,COLOR,WEIGHT
FROM P;
SELECT DISTINCT JNO
FROM SPJ
WHERE SNO='S1';
SELECT PNAME,QTY
FROM SPJ,P
WHERE P.PNO=SPJ.PNO AND SPJ.JNO='J2';
SELECT PNO
FROM SPJ,S
WHERE S.SNO=SPJ.SNO AND CITY='上海';
SELECT JNAME
FROM SPJ,S,J
WHERE S.SNO=SPJ.SNO AND S.CITY='上海' AND J.JNO=SPJ.JNO;
SELECT JNO
FROM SPJ
WHERE JNO NOT IN(SELECT DISTINCT JNO
FROM SPJ,S
WHERE S.SNO=SPJ.SNO AND S.CITY='天津');
UPDATE P
SET COLOR='蓝'
WHERE COLOR='红';
UPDATE SPJ
SET SNO='S3'
WHERE SNO='S5' AND JNO='J4' AND PNO='P6';
DELETE FROM S
WHERE SNO='S2';
DELETE FROM SPJ
WHERE SNO='S2';
INSERT INTO SPJ
VALUES('S2','J6','P4',200);
首先,创建视图
CREATE VIEW SPJ_1 AS
SELECT SNO,PNO,QTY
FROM SPJ
WHERE JNO=
(SELECT JNO
FROM J
WHERE JNAME='三建');
SELECT DISTINCT PNO,QTY
FROM SPJ_1;
SELECT DISTINCT PNO,QTY
FROM SPJ_1
WHERE SNO='S1';
完。
总结:
前几个比较简单,4.(4)和5.(7)用到了NOT IN;4.(5)要分步进行;5.(11)插入数据时若不指明顺序,需要按原表的顺序。
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