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Re: [HACKERS] Date operations

From: Thomas Lockhart <lockhart(at)alumni(dot)caltech(dot)edu>
To: Oliver Smith <oliver(at)kfs(dot)org>
Cc: pgsql-hackers(at)postgreSQL(dot)org
Subject: Re: [HACKERS] Date operations
Date: 1999-03-31 16:21:35
Message-ID: 37024B8F.DE7CE2EE@alumni.caltech.edu (view raw or flat)
Thread:
Lists: pgsql-hackers
> Question 3:
> Because this query gets hit a lot, would it make sense to create an
> index
>  CREATE INDEX tbl_robot_logs_at_age_idx ON tbl_robot_logs
>   ( AGE(at) );

Nope, since "age" is calculated from "now", which is alway changing.
You can't make a useful index on a non-constant expression or
function.

                        - Tom

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