SQL Constraint for Canada Postal Code + US Zip Code?

Question

I've created a constraint for Canadian postal code and it works fine, however when I input a US zip code like 1234567, the record still gets added in. I'm looking for a way to change my constraint so it only accepts 5 numbers ?

Postal_Code varchar2(7) Constraint NN_Investor_PostalCode Null,
Constraint CK_Investor_PostalCode check 
(REGEXP_LIKE (Postal_Code, '[A-Z][0-9][A-Z] [0-9][A-Z][0-9]') 
    or REGEXP_LIKE (Postal_Code, '[1-9][0-9][0-9][0-9][0-9]')), 

Answer 1

You may try this

REGEXP_LIKE (Postal_Code, '[A-Z][0-9][A-Z] [0-9][A-Z][0-9]') 
        or ( REGEXP_LIKE (Postal_Code, '^[1-9][0-9]{4}') and length(Postal_Code)=5

as the check constraint.

Sample demonstration :

with t(Postal_Code) as
(
 select '12345'   from dual union all
 select '32045'   from dual union all 
 select '1234567' from dual union all
 select '123456'  from dual union all
 select  '01234'  from dual 
)
select * 
  from t
 where REGEXP_LIKE (Postal_Code, '[A-Z][0-9][A-Z] [0-9][A-Z][0-9]') 
    or ( REGEXP_LIKE (Postal_Code, '^[1-9][0-9]{4}') and length(Postal_Code)=5 );

POSTAL_CODE
----------- 
  12345
  32045