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primary key on lower(varchar)

From: <me(at)alternize(dot)com>
To: <pgsql-novice(at)postgresql(dot)org>
Subject: primary key on lower(varchar)
Date: 2006-01-07 00:28:07
Message-ID: 0cfb01c61321$3b6d86c0$0201a8c0@iwing (view raw or flat)
Thread:
Lists: pgsql-novice
hi list

why can't i define a primary key on a varchar field as being lower(field)?

i'm getting the following error:

ERROR:  syntax error at or near "(" at character 94:   PRIMARY KEY ((lower(e_name) ));


here's the sql script:

ALTER TABLE "oldtables"."lexikon_entries"
  DROP CONSTRAINT "lexikon_entries_pkey" RESTRICT;

ALTER TABLE "oldtables"."lexikon_entries"
  ADD CONSTRAINT "lexikon_entries_pkey" 
  PRIMARY KEY ((lower(e_name) ));

ALTER INDEX "oldtables"."lexikon_entries_pkey"
  OWNER TO "db_outnow";


this seems to work for normal indices... do i really have to create a 2nd index on the same field?

- thomas

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