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Date: Mon, 15 Aug 2005 23:30:19 -0600
From: Michael Fuhr <mike@fuhr.org>
To: "Marc G. Fournier" <scrappy@postgresql.org>
Cc: pgsql-sql@postgresql.org
Subject: Re: ARRAYs and INDEXes ...
Message-ID: <20050816053019.GA6387@winnie.fuhr.org>
References: <20050816014906.G1002@ganymede.hub.org>
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On Tue, Aug 16, 2005 at 01:54:13AM -0300, Marc G. Fournier wrote:
>
> CREATE TABLE customers (
>   customer_id SERIAL,
>   monthly_balance DECIMAL(7,2)[12]
> );
> 
> Is it possible to create an INDEX on customers.monthly_balance such that I 
> could do something like:
> 
> SELECT * FROM customers WHERE monthly_balance[6] = 0.00;

You could use expression indexes, one per month:

CREATE INDEX customers_mb_1_idx ON customers ((monthly_balance[1]));
CREATE INDEX customers_mb_2_idx ON customers ((monthly_balance[2]));
etc.

> SELECT * FROM customers WHERE 0.00 = any (monthly_balance);

Not sure about that one.

-- 
Michael Fuhr