On Dec 22, 2009, at 16:11 , Scott Marlowe wrote:
alter table test add constraint test_a_check check (a ~
$r$^(0[1-9]|1[0-2]).(19[89][0-9]|20[0-9]{2}|210[0-9]|2110)$$r$);
However, I strongly recommend using a date column with, perhaps, a
restriction that the day field is always 1 or some other agreed-
upon (and
documented) value (e.g., CHECK (val = date_truc('month', val))).
If the
data is date data, you're likely going to want to do other
operations on
the field which will be much easier if it's already a date value.
This is existing database and many application are using it.
I cannot change column type to date since other applications are
expecting
char(7) column.
Just so you know, down this road lies madness.
I completely agree. Schedule some downtime and make the column a date
column.
Michael Glaesemann
grzm seespotcode net
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