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/* drop table Laptop; drop table pc; drop table printer; drop table product; */ -- USE computers; CREATE TABLE Laptop ( code int NOT NULL , model varchar (50) NOT NULL , speed smallint NOT NULL , ram smallint NOT NULL , hd real NOT NULL , price decimal(12,2) NULL , screen tinyint NOT NULL ); CREATE TABLE PC ( code int NOT NULL , model varchar (50) NOT NULL , speed smallint NOT NULL , ram smallint NOT NULL , hd real NOT NULL , cd varchar (10) NOT NULL , price decimal(12,2) NULL ); CREATE TABLE Product ( maker varchar (10) NOT NULL , model varchar (50) NOT NULL , type varchar (50) NOT NULL ); CREATE TABLE Printer ( code int NOT NULL , model varchar (50) NOT NULL , color char (1) NOT NULL , `type` varchar (10) NOT NULL , price decimal(12,2) NULL ); ALTER TABLE Laptop ADD CONSTRAINT PK_Laptop PRIMARY KEY ( code ); ALTER TABLE PC ADD CONSTRAINT PK_pc PRIMARY KEY ( code ); ALTER TABLE Product ADD CONSTRAINT PK_product PRIMARY KEY ( model ); ALTER TABLE Printer ADD CONSTRAINT PK_printer PRIMARY KEY ( code ); ALTER TABLE Laptop ADD CONSTRAINT FK_Laptop_product FOREIGN KEY ( model ) REFERENCES Product ( model ); ALTER TABLE PC ADD CONSTRAINT FK_pc_product FOREIGN KEY ( model ) REFERENCES Product ( model ); ALTER TABLE Printer ADD CONSTRAINT FK_printer_product FOREIGN KEY ( model ) REFERENCES Product ( model ); /*----Product------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ */ insert into Product values('B','1121','PC') ,('A','1232','PC') ,('A','1233','PC') ,('E','1260','PC') ,('A','1276','Printer') ,('D','1288','Printer') ,('A','1298','Laptop') ,('C','1321','Laptop') ,('A','1401','Printer') ,('A','1408','Printer') ,('D','1433','Printer') ,('E','1434','Printer') ,('B','1750','Laptop') ,('A','1752','Laptop') ,('E','2113','PC') ,('E','2112','PC'); /*----PC------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ */ insert into PC values(1,'1232',500,64,5,'12x',600) ,(2,'1121',750,128,14,'40x',850) ,(3,'1233',500,64,5,'12x',600) ,(4,'1121',600,128,14,'40x',850) ,(5,'1121',600,128,8,'40x',850) ,(6,'1233',750,128,20,'50x',950) ,(7,'1232',500,32,10,'12x',400) ,(8,'1232',450,64,8,'24x',350) ,(9,'1232',450,32,10,'24x',350) ,(10,'1260',500,32,10,'12x',350) ,(11,'1233',900,128,40,'40x',980) ,(12,'1233',800,128,20,'50x',970) ; /*----Laptop------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ */ insert into Laptop values(1,'1298',350,32,4,700,11) ,(2,'1321',500,64,8,970,12) ,(3,'1750',750,128,12,1200,14) ,(4,'1298',600,64,10,1050,15) ,(5,'1752',750,128,10,1150,14) ,(6,'1298',450,64,10,950,12) ; /*----Printer------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ */ insert into Printer values(1,'1276','n','Laser',400) ,(2,'1433','y','Jet',270) ,(3,'1434','y','Jet',290) ,(4,'1401','n','Matrix',150) ,(5,'1408','n','Matrix',270) ,(6,'1288','n','Laser',400) ; show tables