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Re: == PostgreSQL Weekly News - February 21 2010 ==

From: David Fetter <david(at)fetter(dot)org>
To: pgsql-announce(at)postgresql(dot)org
Subject: Re: == PostgreSQL Weekly News - February 21 2010 ==
Date: 2010-02-22 15:40:08
Message-ID: 20100222154007.GK2917@fetter.org (view raw or flat)
Thread:
Lists: pgsql-announce
On Sun, Feb 21, 2010 at 11:55:34PM -0800, David Fetter wrote:
> == PostgreSQL 9.0 Feature of the Week ==
> 
> You can now control the behavior of distinct values per column using
> ALTER TABLE...ALTER COLUMN...SET STATISTICS DISTINCT.  Positive
> numbers are assumed to be the number of distinct values, 0 tells the
> planner to use the results from ANALYZE, and negative numbers (which
> should be between -1 and 0, cause the planner to estimate the number
> of distinct values as the estimated number of rows multiplied by the
> absolute value of the number.

This has changed since it was originally written.  The syntax now is

    ALTER TABLE..ALTER COLUMN...SET (attribute=value, ...)

For 9.0, attribute can be n_distinct or n_distinct_inherited, and this
may expand in future major versions.

Thanks to Robert Haas for pointing this out :)

Cheers,
David.
-- 
David Fetter <david(at)fetter(dot)org> http://fetter.org/
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