what does ONLY do - Mailing list pgsql-sql

From Bret Hughes
Subject what does ONLY do
Date
Msg-id 1108778394.9866.498.camel@bretsony
Whole thread Raw
Responses Re: what does ONLY do  (Stephan Szabo <sszabo@megazone.bigpanda.com>)
List pgsql-sql
I can't seem to find an explanation of what adding ONLY does for an sql
statement  for instance :

ALTER TABLE [ONLY] ADD COLUMN ...

or what ever.  Does anyone have a pointer to docs on this.  I am simply
curious since there is obviously something I am missing.

Bret





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