--检查约束
create tablenumber(10) primary key,
       email varchar2(10) check (email like '%@%')
)
drop tableinsert into test1 values(1,'12@6.com');
select * fromcreate tablenumber primary key,
       gender varchar2(4) check(gender in('男','女'))
)
drop tableselect * frominsert into test2 values(1,'男')
create table test30(         
     id number primary key,         
     sex varchar2(2) check(sex ='男' or sex='女')  
);  

参考：Oracle Check约束