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From: Richard Huxton <dev@archonet.com>
To: pgsql-performance@nullmx.com
Cc: pgsql-performance@postgresql.org
Subject: Re: Rewriting DISTINCT and losing performance
Date: Mon, 21 May 2007 12:40:21 +0100
Message-ID: <46518525.9010407@archonet.com> (raw)
In-Reply-To: <200705202228.32129.pgsql-performance@nullmx.com>
References: <200705202228.32129.pgsql-performance@nullmx.com>

Chuck D. wrote:
>                 Table "geo.city"
>    Column   |          Type          | Modifiers
> ------------+------------------------+-----------
>  city_id    | integer                | not null
>  state_id   | smallint               |
>  country_id | smallint               |
>  latitude   | numeric(9,7)           |
>  longitude  | numeric(10,7)          |
>  city_name  | character varying(100) |
> Indexes:
>     "city_pk" PRIMARY KEY, btree (city_id)
>     "idx_city_country_id" btree (country_id) CLUSTER
> Foreign-key constraints:
>     "city_state_id_fk" FOREIGN KEY (state_id) REFERENCES geo.state(state_id)
> ON UPDATE CASCADE ON DELETE CASCADE

Any good reason why country_id is NULLable?

-- 
   Richard Huxton
   Archonet Ltd

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