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* Re: How can unique columns being case-insensitive be accomplished?
@ 2002-09-16 13:38 Tom Lane <tgl@sss.pgh.pa.us>
0 siblings, 1 reply; 2+ messages in thread
From: Tom Lane @ 2002-09-16 13:38 UTC (permalink / raw)
To: J rg <mail2holly@gmx.de>; +Cc: pgsql-sql
"Jörg" <mail2holly@gmx.de> writes:
> How can this problem be overcome? Any ideas?
Create a unique index on lower(name).
regards, tom lane
^ permalink raw reply [nested|flat] 2+ messages in thread
* Re: How can unique columns being case-insensitive be accomplished?
@ 2002-09-16 15:09 Ross J. Reedstrom <reedstrm@rice.edu>
parent: Tom Lane <tgl@sss.pgh.pa.us>
0 siblings, 0 replies; 2+ messages in thread
From: Ross J. Reedstrom @ 2002-09-16 15:09 UTC (permalink / raw)
To: pgsql-sql@postgresql.org, J366rg <mail2holly@gmx.de>
On Mon, Sep 16, 2002 at 09:38:46AM -0400, Tom Lane wrote:
> "Jörg" <mail2holly@gmx.de> writes:
> > How can this problem be overcome? Any ideas?
>
> Create a unique index on lower(name).
I'm sure Jörg can follow this tip, but for the archives, I'll include
the full syntax:
CREATE UNIQUE INDEX drug_lwr_idx ON drug ( lower(name) )
Another trick would be to use your trigger to lower() the inserted/updated
names, rather than only as a test, combined with a regular unique index:
CREATE FUNCTION lower_drug () RETURNS OPAQUE AS '
BEGIN
NEW.name = lower(NEW.name);
RETURN NEW;
END;
' LANGUAGE 'plpgsql';
CREATE TRIGGER drug_insert BEFORE UPDATE OR INSERT ON drug
FOR EACH ROW EXECUTE PROCEDURE lower_drug();
That keeps your data nice and clean and consistent, otherwise
the first time a MixedCaseDrugName goes in, it'll keep the correct
'mixedcasedrugname' from being inserted, later. Be very sure that lower()
gives you exactly the output you want, however.
Ross
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2002-09-16 13:38 Re: How can unique columns being case-insensitive be accomplished? Tom Lane <tgl@sss.pgh.pa.us>
2002-09-16 15:09 ` Ross J. Reedstrom <reedstrm@rice.edu>
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