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From: Stephan Szabo <[email protected]>
To: Thomas F.O'Connell <[email protected]>
Cc: General <[email protected]>
Subject: Re: Indexes on Expressions -- Parentheses
Date: Tue, 28 Sep 2004 22:30:55 -0700 (PDT)
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

[email protected]

On Tue, 28 Sep 2004, Thomas F.O'Connell wrote:

>  From 11.5 in the docs:
>
> "The syntax of the CREATE INDEX command normally requires writing
> parentheses around index expressions, as shown in the second example.
> The parentheses may be omitted when the expression is just a function
> call, as in the first example."
>
> But when I try this:
>
> db=# CREATE INDEX expression_idx on some_table( extract( year from
> some_column ) );

Extract(year from some_column) is not really just a function call it's
an expression that looks similar to a function call because that's how SQL
defined it.

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