LY_624的专栏

创建三张表，向其中插入数据，并运行： Create Table Student( sno char(10) not null, sname varchar(20), sage smallint, ssex char(1), sdept char(2), primary key (sno), check(ssex in ('M','F'))) Create Table Co

Create Table Student( sno char(10) not null, sname varchar(20), sage smallint, ssex char(1), sdept char(2), primary key (sno), check(ssex in ('M','F'))) Create Table Course( cno char(10) not null, c