From: Rajesh Kumar Mallah. <mallah@trade-india.com>
To: Christopher Kings-Lynne <chriskl@familyhealth.com.au>
To: pgsql-sql@postgresql.org
Subject: Re: Is Dropping a column "CHECK" constraint possible?
Date: Sun, 7 Jul 2002 19:15:10 +0530
Message-ID: <200207071915.10489.mallah@trade-india.com> (raw)
In-Reply-To: <00e101c224a6$81ee3bc0$0200a8c0@SOL>
References: <200207051729.42137.mallah@trade-india.com>
<00e101c224a6$81ee3bc0$0200a8c0@SOL>
Hi ,
i want to enforce that a coulumn 'imp'
shud either contain valid data or no data at all.
by valid data i mean data having at least one non whitespace character.
will this constraint be approprote for accomplishing it?
tradein_client=> ALTER TABLE t_a ADD CHECK ( length( btrim(imp) ) > 1 or imp is NULL );
regards
mallah.
On Saturday 06 July 2002 10:05, Christopher Kings-Lynne wrote:
> > can anyone please help?
> > i have a to drop a check contstraint from a column. eg
> >
> > tradein_clients=# \d t_a
> > Table "t_a"
> > Column | Type | Modifiers
> > ------------+---------+-----------
> > company_id | integer |
> > exp | text |
> > imp | text |
> > Check constraints: "$1" (length(imp) > 1)
> > "aaaaaq" (length(imp) > 1)
> >
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To: pgsql-sql@postgresql.org
Cc: mallah@trade-india.com, chriskl@familyhealth.com.au
Subject: Re: Is Dropping a column "CHECK" constraint possible?
In-Reply-To: <200207071915.10489.mallah@trade-india.com>
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