+
+
1、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：
（1）
+
+
+
+
+
+ σ
+
+
+
+ A
+
+
+ =
+
+
+ 10
+
+
+
+
+ (
+
+
+ S
+
+
+ )
+
+
+
+ \sigma_{A = 10}(S)
+
+
+ σA=10(S)
+
SELECT *
+FROM S
+WHERE A=10
+
+
（2）
+
+
+
+
+
+ Π
+
+
+
+ A
+
+
+ ,
+
+
+ B
+
+
+
+
+ (
+
+
+ S
+
+
+ )
+
+
+
+ \Pi_{A,B}(S)
+
+
+ ΠA,B(S)
+
SELECT DISTINCT A,B
+FROM S
+
+
（3）
+
+
+
+
+ S
+
+
+ ⋈
+
+
+ T
+
+
+
+ S \Join T
+
+
+ S⋈T
+
SELECT A,B,S.C,S.D,E,F
+FROM S,T
+WHERE S.C=T.C AND S.D=T.D
+
+
（4）
+
+
+
+
+ S
+
+
+
+
+ ⋈
+
+
+
+
+ S
+
+
+ .
+
+
+ C
+
+
+ =
+
+
+ T
+
+
+ .
+
+
+ C
+
+
+
+
+ T
+
+
+
+ S \underset{S.C=T.C}\Join T
+
+
+ SS.C=T.C⋈T
+
SELECT A,B,S.C,S.D,T.C,T.D,E,F
+FROM S,T
+WHERE S.C=T.C
+
+
（5）
+
+
+
+
+ S
+
+
+
+
+ ⋈
+
+
+
+
+ A
+
+
+ <
+
+
+ E
+
+
+
+
+ T
+
+
+
+ S \underset{A<E}\Join T
+
+
+ SA<E⋈T
+
SELECT A,B,S.C,S.D,T.C,T.D,E,F
+FROM S,T
+WHERE A<E
+
+
*（6）
+
+
+
+
+
+ Π
+
+
+
+ C
+
+
+ ,
+
+
+ D
+
+
+
+
+ (
+
+
+ S
+
+
+ )
+
+
+ ×
+
+
+ T
+
+
+
+ \Pi_{C,D}(S) \times T
+
+
+ ΠC,D(S)×T
+
SELECT S1.C,S1.D,T.C,T.D,E,F
+FROM T,(SELECT DISTINCT C,D
+ FROM S)
+ AS S1
+
+
错误点：第六小题，我写的是
+
SELECT DISTINCT S.C,S.D,T.*
+FROM S,T
+
+
这样一开始就把T里面的重复行去掉了，错误
+
2、用SQL语句建立第二章习题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。
+
S:
+
CREATE TABLE S(SNO CHAR(10),
+ SNAME CHAR(10),
+ STATUS SMALLINT,
+ CITY CHAR(10),
+ );
+INSERT INTO S(SNO,SNAME,STATUS,CITY) VALUES ('S1','精益',20,'天津');
+INSERT INTO S(SNO,SNAME,STATUS,CITY) VALUES('S2','盛锡',10,'北京');
+INSERT INTO S(SNO,SNAME,STATUS,CITY) VALUES('S3','东方红',30,'北京');
+INSERT INTO S(SNO,SNAME,STATUS,CITY) VALUES('S4','丰泰盛',20,'天津');
+INSERT INTO S(SNO,SNAME,STATUS,CITY) VALUES('S5','为民',30,'上海');
+
+
P:
+
CREATE TABLE P(PNO CHAR(10),
+ PNAME CHAR(10),
+ COLOR CHAR(10),
+ WEIGHT SMALLINT
+ );
+INSERT INTO P(PNO,PNAME,COLOR,WEIGHT) VALUES('P1','螺母','红',12);
+INSERT INTO P(PNO,PNAME,COLOR,WEIGHT) VALUES('P2','螺栓','绿',17);
+INSERT INTO P(PNO,PNAME,COLOR,WEIGHT) VALUES('P3','螺丝刀','蓝',14);
+INSERT INTO P(PNO,PNAME,COLOR,WEIGHT) VALUES('P4','螺丝刀','红',14);
+INSERT INTO P(PNO,PNAME,COLOR,WEIGHT) VALUES('P5','凸轮','蓝',40);
+INSERT INTO P(PNO,PNAME,COLOR,WEIGHT) VALUES('P6','齿轮','红',30);
+
+
J:
+
CREATE TABLE J(JNO CHAR(10),
+ JNAME CHAR(10),
+ CITY CHAR(10)
+ );
+INSERT INTO J(JNO,JNAME,CITY) VALUES('J1','三建','北京');
+INSERT INTO J(JNO,JNAME,CITY) VALUES('J2','一汽','长春');
+INSERT INTO J(JNO,JNAME,CITY) VALUES('J3','弹簧厂','天津');
+INSERT INTO J(JNO,JNAME,CITY) VALUES('J4','造船厂','天津');
+INSERT INTO J(JNO,JNAME,CITY) VALUES('J5','机车厂','唐山');
+INSERT INTO J(JNO,JNAME,CITY) VALUES('J6','无线电厂','常州');
+INSERT INTO J(JNO,JNAME,CITY) VALUES('J7','半导体厂','南京');
+
+
SPJ:
+
CREATE TABLE SPJ(SNO CHAR(4),
+ PNO CHAR(4),
+ JNO CHAR(4),
+ QTY SMALLINT
+ );
+INSERT INTO SPJ(SNO,PNO,JNO,QTY) VALUES('S1','P1','J1',200);
+INSERT INTO SPJ(SNO,PNO,JNO,QTY) VALUES('S1','P1','J3',100);
+INSERT INTO SPJ(SNO,PNO,JNO,QTY) VALUES('S1','P1','J4',700);
+INSERT INTO SPJ(SNO,PNO,JNO,QTY) VALUES('S1','P2','J2',100);
+INSERT INTO SPJ(SNO,PNO,JNO,QTY) VALUES('S2','P3','J1',400);
+INSERT INTO SPJ(SNO,PNO,JNO,QTY) VALUES('S2','P3','J2',200);
+INSERT INTO SPJ(SNO,PNO,JNO,QTY) VALUES('S2','P3','J4',500);
+INSERT INTO SPJ(SNO,PNO,JNO,QTY) VALUES('S2','P3','J5',400);
+INSERT INTO SPJ(SNO,PNO,JNO,QTY) VALUES('S2','P5','J1',400);
+INSERT INTO SPJ(SNO,PNO,JNO,QTY) VALUES('S2','P5','J2',100);
+INSERT INTO SPJ(SNO,PNO,JNO,QTY) VALUES('S3','P1','J1',200);
+INSERT INTO SPJ(SNO,PNO,JNO,QTY) VALUES('S3','P3','J1',200);
+INSERT INTO SPJ(SNO,PNO,JNO,QTY) VALUES('S4','P5','J1',100);
+INSERT INTO SPJ(SNO,PNO,JNO,QTY) VALUES('S4','P6','J3',300);
+INSERT INTO SPJ(SNO,PNO,JNO,QTY) VALUES('S4','P6','J4',200);
+INSERT INTO SPJ(SNO,PNO,JNO,QTY) VALUES('S5','P2','J4',100);
+INSERT INTO SPJ(SNO,PNO,JNO,QTY) VALUES('S5','P3','J1',200);
+INSERT INTO SPJ(SNO,PNO,JNO,QTY) VALUES('S5','P6','J2',200);
+INSERT INTO SPJ(SNO,PNO,JNO,QTY) VALUES('S5','P6','J4',500);
+
+
（1）求供应工程J1零件的供应商号码SNO；
+
SELECT SNO
+FROM SPJ
+WHERE JNO='J1';
+
+
（2）求供应工程J1零件P1的供应商号码SNO；
+
SELECT 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；
+
SELECT SNO
+FROM SPJ,P
+WHERE P.PNO=SPJ.PNO AND JNO='J1' AND COLOR='红';
+
+
（4）求没有使用天津供应商生产的红色零件的工程号JNO；
+
SELECT JNO
+FROM J
+WHERE NOT EXISTS(
+ SELECT *
+ FROM SPJ,S,P
+ WHERE S.CITY='天津' AND P.COLOR='红' AND SPJ.JNO=J.JNO AND SPJ.SNO=S.SNO AND SPJ.PNO=P.PNO);
+
+
（5）求至少用了供应商S1所供应的全部零件的工程号JNO。
+
SELECT DISTINCT JNO
+FROM SPJ SPJX
+WHERE NOT EXISTS
+ (SELECT *
+ FROM SPJ SPJY
+ WHERE SPJY.SNO='S1' AND NOT EXISTS
+ (SELECT *
+ FROM SPJ SPJZ
+ WHERE SPJZ.PNO=SPJY.PNO AND SPJZ.JNO=SPJX.JNO));
+
+
第五小题做了半天又去翻了一下以前的例题才写出来，有点费劲
+
3、针对习题4中的4个表使用SQL完成以下各项操作：
（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 P,SPJ
+WHERE JNO='J2' AND P.PNO=SPJ.PNO
+
+
（5）找出上海厂商供应的所有零件号码；
+
SELECT DISTINCT PNO
+FROM SPJ,S
+WHERE S.SNO=SPJ.SNO AND CITY='上海'
+
+
或
+
SELECT DISTINCT PNO
+FROM SPJ
+WHERE SNO IN(SELECT SNO
+ FROM S
+ WHERE CITY='上海'
+ );
+
+
（6）找出使用上海产的零件的工程名称；
+
SELECT DISTINCT JNAME
+FROM SPJ,S,J
+WHERE S.SNO=SPJ.SNO AND S.CITY='上海' AND J.JNO=SPJ.JNO
+
+
或
+
SELECT JNAME
+FROM J
+WHERE JNO IN(SELECT JNO
+ FROM SPJ, S
+ WHERE SPJ. SNO=S.SNO AND S.CITY='上海');
+
+
（7）找出没有使用天津产的零件的工程号码；
+
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')
+
+
或
+
SELECT JNO
+FROM J
+WHERE NOT EXISTS (SELECT *
+ FROM SPJ
+ WHERE SPJ.JNO=J.JNO AND SNO IN(SELECT SNO
+ FROM S
+ WHERE CITY='天津'))
+
+
（8）把全部红色零件的颜色改成蓝色；
+
UPDATE P
+SET COLOR='蓝'
+WHERE COLOR='红'
+
+
（9）由S5供给J4的零件P6改为由S3供应，请作必要的修改；
+
UPDATE SPJ
+SET SNO='S3'
+WHERE SNO='S5' AND JNO='J4' AND PNO='P6';
+
+
（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；
+
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','P4','J6',200);
+
+
或
+
INSERT INTO SPJ(SNO,PNO,JNO,QTY) VALUES('S2','P4','J6',200);
+
+
4、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)、供应商数量（QTY）。针对该视图完成下列查询：
+
CREATE VIEW VIEW_SPJ
+AS
+SELECT SNO,PNO,QTY
+FROM SPJ
+WHERE JNO=(SELECT JNO
+ FROM J
+ WHERE JNAME='三建')
+
+
（1）找出三建工程项目使用的各种零件代码及其数量；
+
SELECT PNO,QTY
+FROM VIEW_SPJ
+
+
（2）找出供应商S1的供应情况；
+
SELECT *
+FROM SPJVIEW
+WHERE SNO='S1'
+
+
时间：做题-对答案-看错题-完成博客，两个小时
+