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test1
create table Student( Sno varchar(20) not null primary key, Sname varchar(20) not null , Ssex varchar(20) not null, Sbirthday datetime , Class varchar(20) ) create table Teacher( Tno varchar(20) not null primary key, Tname varchar(20) not null , Tsex varchar(20) not null, Tbirthday datetime, Prof varchar(20) , Depart varchar(20) not null ) create table Class ( Cno varchar(20) not null primary key, Cname varchar(20) not null, Tno varchar(20) not null, constraint for_key Foreign key(Tno) references Teacher(Tno) )
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