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Re: What gets inherited

From: John Taylor <postgres(at)jtresponse(dot)co(dot)uk>
To: "PgSQL Novice" <pgsql-novice(at)postgresql(dot)org>
Subject: Re: What gets inherited
Date: 2002-06-18 16:47:55
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-novice
On Tuesday 18 June 2002 16:45, I wrote:
> On Tuesday 18 June 2002 16:19, I wrote:
> > Hi,
> > 
> > If I create a table that inherits from another, it inherits all the attributes,
> > but does not appear to inherit the constraints, or indexes
> > 
> Just double checked.
> It seems that indexes DO get inherited, but I'm not sure about the rest.
> (I don't think I had enough rows for the optimizer to kick in indexed searches before)

Nope - thats not it....

john=# create index parent_value on parent(value);
john=# explain select * from parent where value='foo';
Result  (cost=0.00..30.64 rows=20 width=24)
  ->  Append  (cost=0.00..30.64 rows=20 width=24)
        ->  Index Scan using parent_value on parent  (cost=0.00..8.14 rows=10 width=24)
        ->  Seq Scan on child parent  (cost=0.00..22.50 rows=10 width=24)

Now I'm really confused.
Can someone explain what is really going on !


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