騰訊雲服務器 雲數據庫MySQL

 

CREATE TABLE if not exists `student` ( 
`Sno` varchar (20) NOT NULL , PRIMARY KEY (`Sno`) ) ENGINE = innodb DEFAULT CHARACTER SET = "big5" COLLATE = "big5_chinese_ci"

ALTER TABLE `student` 
 ADD COLUMN `Sno` varchar (20) NOT NULL , ADD PRIMARY KEY USING BTREE (`Sno`),
ADD COLUMN `Sname` varchar (20) NOT NULL , 
ADD COLUMN `Sage` varchar (20) NOT NULL 

CREATE TABLE if not exists `course` (
 `Cno` varchar (20) NOT NULL , 
PRIMARY KEY (`Cno`) ) ENGINE = innodb DEFAULT CHARACTER SET = "big5" COLLATE = "big5_chinese_ci"

CREATE TABLE if not exists `SC` ( 
`Sno` varchar (20) NOT NULL ,`Cno` varchar (20) NOT NULL ,
`Grade` smallint (20) NOT NULL , PRIMARY KEY (`Cno`) ) ENGINE = innodb DEFAULT CHARACTER SET = "big5"

ALTER TABLE `SC` ADD CONSTRAINT sFK1 FOREIGN KEY (`Sno`) REFERENCES `test`.`student` (`Sno`) ON DELETE RESTRICT ON UPDATE RESTRICT, ADD CONSTRAINT sFK2 FOREIGN KEY (`Cno`) REFERENCES `test`.`course` (`Cno`) ON DELETE RESTRICT ON UPDATE RESTRICT