Re: [GENERAL] How to define the limit length for numeric type? - Mailing list pgsql-general

On 03/12/2017 12:33 AM, vod vos wrote:
> So there is  no other simpler method for checking that? like varchar(4), only 4 char can be input?

That is not how that works:

test=# create table  varchar_test(fld_1 varchar(4));
CREATE TABLE

test=# \d varchar_test
         Table "public.varchar_test"
  Column |         Type         | Modifiers
--------+----------------------+-----------
  fld_1  | character varying(4) |

INSERT INTO varchar_test VALUES ('test'), ('tes'), ('te'), ('t');
INSERT 0 4

test=# select * from varchar_test ;
  fld_1
-------
  test
  tes
  te
  t
(4 rows)

test=# INSERT INTO varchar_test VALUES ('tests');
ERROR:  value too long for type character varying(4)

It just sets the upper limit of what can be entered.

>
> would using regexp cost more CPU or memory resources?
>
>



--
Adrian Klaver
adrian.klaver@aklaver.com