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Under the hood of views

From: David Kerr <dmk(at)mr-paradox(dot)net>
To: pgsql-performance(at)postgresql(dot)org
Subject: Under the hood of views
Date: 2009-08-13 16:07:48
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
 developer came by and asked me an interesting question.

If he has a view with 20 columns in it, and he selects a specific column from the view
in his query. Does the engine when accessing the view return all columns? or is it 
smart enough to know to just retrive the one?


create view test as
select a,b,c,d,e,f,g from testtable;

select a from test;

(does the engine retrieve b-g?)




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Subject: Re: Under the hood of views
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Subject: Re: How to run this in reasonable time:

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