Code:
Create table students
(
Sid number(3),
Sname varchar(20) not null,
Email varchar(20) not null,
Doj Timestamp default sysdate not null,
Dob date not null,
Phno number(10),
Address varchar(20),
Resume LONG,
Gender char(1) Default 'M',
Cid number,
Constraint Pk_stu_sid Primary key(sid,cid),
Constraint Un_stud_email Unique(email),
Constraint chk_stud_email Check(email like '%@%.%'),
Constraint chk_stud_phno Check(length(phno) = 10),
Constriant chk_stud_gender Check(gender in ('M','F')),
Constraint Fk_stud_cid foreign key(cid) references
course(cid))
)when i run the above code i m getting error like this...I dont understand wat error it is...Because i didnt reference any column in the check constraint...Thn why it says that i m referencing some column..
Error:
Code:
SQL>
SQL> Create table students
2 (
3 Sid number(3),
4 Sname varchar(20) not null,
5 Email varchar(20) not null,
6 Doj Timestamp default sysdate not null,
7 Dob date not null,
8 Phno number(10),
9 Address varchar(20),
10 Resume LONG,
11 Gender char(1) Default 'M',
12 Cid number,
13 Constraint Pk_stu_sid Primary key(sid,cid),
14 Constraint Un_stud_email Unique(email),
15 Constraint chk_stud_email Check(email like '%@%.%'),
16 Constraint chk_stud_phno Check(length(phno) = 10),
17 Constriant chk_stud_gender Check(gender in ('M','F')),
18 Constraint Fk_stud_cid foreign key(cid) references
19 course(cid))
20 )
21 /
Constriant chk_stud_gender Check(gender in ('M','F')),
*
ERROR at line 17:
ORA-02438: Column check constraint cannot reference other columns