Initial commit

Homework/Homework250313/CreateTable.sql

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+USE Homework250313;
+
+CREATE TABLE S
+(
+    SNO    CHAR(2) PRIMARY KEY,
+    SNAME  VARCHAR(20),
+    STATUS INT,
+    CITY   VARCHAR(20)
+);
+
+CREATE TABLE P
+(
+    PNO    CHAR(2) PRIMARY KEY,
+    PNAME  VARCHAR(20),
+    COLOR  VARCHAR(10),
+    WEIGHT INT
+);
+
+CREATE TABLE J
+(
+    JNO   CHAR(2) PRIMARY KEY,
+    JNAME VARCHAR(20),
+    CITY  VARCHAR(20)
+);
+
+CREATE TABLE SPJ
+(
+    SNO CHAR(2),
+    PNO CHAR(2),
+    JNO CHAR(2),
+    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)
+);

Homework/Homework250313/InsertData.sql

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+USE Homework250313;
+INSERT INTO S (SNO, SNAME, STATUS, CITY)
+VALUES ('S1', N'精益', 20, N'天津'),
+       ('S2', N'盛锡', 10, N'北京'),
+       ('S3', N'东方红', 30, N'北京'),
+       ('S4', N'丰泰盛', 20, N'天津'),
+       ('S5', N'为民', 30, N'上海');
+INSERT INTO P (PNO, PNAME, COLOR, WEIGHT)
+VALUES ('P1', N'螺母', N'红', 12),
+       ('P2', N'螺栓', N'绿', 17),
+       ('P3', N'螺丝刀', N'蓝', 14),
+       ('P4', N'螺丝刀', N'红', 14),
+       ('P5', N'凸轮', N'蓝', 40),
+       ('P6', N'齿轮', N'红', 30);
+INSERT INTO J (JNO, JNAME, CITY)
+VALUES ('J1', N'三建', N'北京'),
+       ('J2', N'一汽', N'长春'),
+       ('J3', N'弹簧厂', N'天津'),
+       ('J4', N'造船厂', N'天津'),
+       ('J5', N'机车厂', N'唐山'),
+       ('J6', N'无线电厂', N'常州'),
+       ('J7', N'半导体厂', N'南京');
+INSERT INTO SPJ (SNO, PNO, JNO, QTY)
+VALUES ('S1', 'P1', 'J1', 200),
+       ('S1', 'P1', 'J3', 100),
+       ('S1', 'P1', 'J4', 700),
+       ('S1', 'P2', 'J2', 100),
+       ('S2', 'P3', 'J1', 400),
+       ('S2', 'P3', 'J2', 200),
+       ('S2', 'P3', 'J4', 500),
+       ('S2', 'P3', 'J5', 400),
+       ('S2', 'P5', 'J1', 400),
+       ('S2', 'P5', 'J2', 100),
+       ('S3', 'P1', 'J1', 200),
+       ('S3', 'P3', 'J1', 200),
+       ('S4', 'P5', 'J1', 100),
+       ('S4', 'P6', 'J3', 300),
+       ('S4', 'P6', 'J4', 200),
+       ('S5', 'P2', 'J4', 100),
+       ('S5', 'P3', 'J1', 200),
+       ('S5', 'P6', 'J2', 200),
+       ('S5', 'P6', 'J4', 50);

Homework/Homework250313/Query.sql

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+USE Homework250313
+Go
+-- 求供应工程 J1 零件的供应商号 SNO
+SELECT DISTINCT SNO
+FROM SPJ
+WHERE JNO = 'J1';
+Go
+-- 求供应工程 J1 零件 P1 的供应商号 SNO
+SELECT DISTINCT SNO
+FROM SPJ
+WHERE JNO = 'J1'
+  AND PNO = 'P1';
+Go
+-- 求供应工程 J1 红色零件的供应商号 SNO
+SELECT DISTINCT SPJ.SNO
+FROM SPJ
+         JOIN P ON SPJ.PNO = P.PNO
+WHERE SPJ.JNO = 'J1'
+  AND P.COLOR = N'红';
+Go
+-- 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 JNO NOT IN (SELECT DISTINCT SPJ.JNO
+                  FROM SPJ
+                           JOIN S ON SPJ.SNO = S.SNO
+                           JOIN P ON SPJ.PNO = P.PNO
+                  WHERE S.CITY = N'天津'
+                    AND P.COLOR = N'红');
+Go
+-- 求至少用了 S1 供应商所供应的全部零件的工程号 JNO
+SELECT JNO
+FROM SPJ
+WHERE PNO IN (SELECT PNO FROM SPJ WHERE SNO = 'S1')
+GROUP BY JNO
+HAVING COUNT(DISTINCT PNO) = (SELECT COUNT(DISTINCT PNO) FROM SPJ WHERE SNO = 'S1');
+Go
+-- 找出所有供应商的姓名和所在城市
+SELECT SNAME, CITY
+FROM S;
+Go
+-- 找出所有零件的名称、颜色、重量
+SELECT PNAME, COLOR, WEIGHT
+FROM P;
+Go
+-- 找出使用供应商 S1 所供应零件的工程号码
+SELECT DISTINCT JNO
+FROM SPJ
+WHERE SNO = 'S1';
+Go