index on to_char(created, 'YYYY') doesn't work

From: Andreas Joseph Krogh <andreak(at)officenet(dot)no>
To: pgsql-sql(at)postgresql(dot)org
Subject: index on to_char(created, 'YYYY') doesn't work
Date: 2003-01-15 11:37:05
Message-ID: 200301151137.05697.andreak@officenet.no
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The following does not work:

create index session_u_idx on session (to_char(created, 'YYYY'));
ERROR: parser: parse error at or near "'YYYY'" at character 57

Can I make a function to do this and index using the result of that funtion?
Do anyone have an example of such a function?

- --
Andreas Joseph Krogh <andreak(at)officenet(dot)no>
There will always be someone who agrees with you
but is, inexplicably, a moron.

gpg public_key: http://dev.officenet.no/~andreak/public_key.asc
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