sorry it doesn't works, as my postgres is 7.3 not 7.4. any other alternative
solution for version after 7.4??
Thank
Ray : )
----- Original Message -----
From: "Rosser Schwarz" <rosser.schwarz@gmail.com>
To: "Ray" <ray_siu@ge-ts.com.hk>
Cc: <pgsql-performance@postgresql.org>
Sent: Thursday, October 21, 2004 11:34 AM
Subject: Re: [PERFORM] create index with substr function
> while you weren't looking, Ray wrote:
>
> > CREATE INDEX idx_doc_substr_doc_urn ON doc USING btree
(SUBSTR(doc_urn,10));
>
> CREATE INDEX idx_doc_substr_doc_urn ON doc USING btree
((SUBSTR(doc_urn,10)));
>
> You need an additional set of parens around the SUBSTR() call.
>
> /rls
>
> --
> :wq
>