Subject: Re: how do I check for lower case
From: Scott Marlowe <smarlowe@g2switchworks.com>
To: Juliann Meyer <Julie.Meyer@noaa.gov>
Cc: pgsql-sql@postgresql.org
In-Reply-To: <44DB97C5.9090307@noaa.gov>
References: <44DB97C5.9090307@noaa.gov>
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Date: Thu, 10 Aug 2006 16:57:58 -0500

On Thu, 2006-08-10 at 15:32, Juliann Meyer wrote:
> I have a table with a column, lets call it identifier, that is defined 
> as varchar(8) that should never contain lower case letters.  Its a large 
> table.  Is there a way to query the table to see if any values in this 
> column are lower case and to get a list out?  The user interface 
> application that users use prevents them from adding an entry in lower 
> case  now, but didn't in earlier version. 

You can also use the same upper / lower functions to make sure no lower
case stuff gets into the table at a later date:

test=> create table aaa (a text check (upper(a)=a));
CREATE TABLE
test=> insert into aaa (a) values ('ABC');
INSERT 2120799293 1
test=> insert into aaa (a) values ('ABC123');
INSERT 2120799294 1
test=> insert into aaa (a) values ('ABC12a3');
ERROR:  new row for relation "aaa" violates check constraint "aaa_a"

viola!