Re: subqueries vs. separate queries - Mailing list pgsql-general

From Guy Fraser
Subject Re: subqueries vs. separate queries
Date
Msg-id 401985B5.2030307@incentre.net
Whole thread Raw
In response to subqueries vs. separate queries  (CSN <cool_screen_name90001@yahoo.com>)
List pgsql-general
CSN wrote:

>Is there much difference between using subqueries and
>separating out them into separate queries?
>
>
That would depend on what results your expecting, and how you intend on using the results.

For example if you want all the data in a single statement, you can't break it up, but the request will likely use more
resourcesto complete. 
If your application can cut and paste the data from multiple transactions, then simple queries may need less resources
tocomplete, but remember that your application will require resources to cut and paste the results as well. 

I have written a number of PHP functions that uses an array the results of a query to generate formatted html tables,
graphsand statistical information. It is easiest to use a single complex query with subqueries, but it is possible to
'fake'a complex query by 'stacking' multiple results into an array. 

Hope that helps.






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