I'm guessing it's because char gets padded with spaces to the specified
length.
Any reason you are using char(3) instead of varchar(3)? And why are you
storing numbers as a string, anyway? If you defined the column as a
numeric type, postgres will tell you if you try to insert something
non-numeric.
Dmitri
-----Original Message-----
From: pgsql-sql-owner@postgresql.org
[mailto:pgsql-sql-owner@postgresql.org] On Behalf Of Sebastian Siewior
Sent: Monday, August 15, 2005 6:20 PM
To: pgsql-sql@postgresql.org
Subject: [SQL] Problem with a Pettern Matching Check
Hello hopefully correct List,
I was trying to do something that is not working as it supposed to.
First I created a table:
create table t ( col CHAR (3) CONSTRAINT numonly_col CHECK ( col ~ '^\\d+$' )
);
This check avoids non-numbers like '1a1' and allows '123'. For some
reason, I'm unable to find out why, it also avoids things like '1' and
'12'. Could someone please give me hint? :)
I was trying this one on PostgreSQL 8.0.3
--
Regards
Sebastian Siewior
---------------------------(end of broadcast)---------------------------
TIP 9: In versions below 8.0, the planner will ignore your desire to choose an index scan if your joining column's
datatypesdo not match
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