Validation on the first two letter

Question

Hi,
Can anyone help me how to write a PLSQL code.
The code should check that the first two letter is a letter and then follow by a number e.g AB123456, BC123456.
When entering a number for the first two and error should be appear.
Regards,
Ekas

Answer 1

Is there any PLSQL code that can check that specific validation?A check constraint will do, no PL/SQL code is needed:
SQL> create table t (col varchar2(8));
Table created.
SQL> alter table t add constraint t_chk  check (    regexp_replace(substr(col, 1, 2), '[[:alpha:]]') is null
  2                                             and regexp_replace((substr(col, 3)), '[[:digit:]]') is null
  3                                            );
Table altered.
SQL>                                          
SQL> insert into t values ('12345678');
insert into t values ('12345678')
ERROR at line 1:
ORA-02290: check constraint (HOEK.T_CHK) violated
SQL> insert into t values ('ABCDEFGH');
insert into t values ('ABCDEFGH')
ERROR at line 1:
ORA-02290: check constraint (HOEK.T_CHK) violated
SQL> insert into t values ('AB123456');
1 row created.Edited by: hoek on Jun 11, 2010 3:23 PM