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Re: Collation and Case Insensitivity

From: Kenneth Marshall <ktm(at)rice(dot)edu>
To: Phillip Smith <phillip(at)softworks(dot)com>
Cc: pgsql-novice(at)postgresql(dot)org
Subject: Re: Collation and Case Insensitivity
Date: 2011-01-13 15:11:27
Message-ID: 20110113151127.GP5474@aart.is.rice.edu (view raw or flat)
Thread:
Lists: pgsql-novice
On Thu, Jan 13, 2011 at 02:33:46PM -0000, Phillip Smith wrote:
> Hi,
>  
> Im moving over from MS SQL. I've been googling this for ages now and suprisingly cannot find a clear answer.
>  
> I want my data in tables to be case insensitive.
>  
> This is so i can:
>  
> 1. Put keys on natural key fields, for instance a product part number. I product number 'ABC123' inserted i need to disallow 'abc123' to be inserted as a second row. Please don't tell me i have to add another column holding a lowered version of the product number. My database is littered with this need and i would end up bloating my table schema.
>  
> 2.  I need to query case insensitively. SELECT * FROM product WHERE product_number = 'ABC123' should return the same row as SELECT * FROM product WHERE product_number = 'abc123'
>  
> Is there a database wide collation setting i can make. There are lots of online posts regarding using LOWER function for querying. This is a workaround for point (2) but does not remedy point (1) above.
>  
> Many thanks
>  
> Phillip
>  
> Phillip Smith

There is a citext module that may help:

http://www.postgresql.org/docs/9.0/static/citext.html

Alternatively, you could use a trigger on INSERT/UPDATE to
automatically lower() the incoming data which would allow
(2) to work.

Regards,
Ken

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