Re: is there a way to return multiple cursors from a query

From: david wendelken <davewendelken_at_earthlink.net>
Date: Wed, 2 Feb 2005 11:22:48 -0800 (PST)
Message-ID: <20611120.1107372168970.JavaMail.root@donald.psp.pas.earthlink.net>

>From your description, it only sounds like you need two cursors returned because you want to pass the first cursor result to the second query. If so, why not just combine the two queries into one statement and return the cursor from that statement?

Example:

select p.col_a, p.col_b, c.col_c, c.col_d from (select x.col_a, x.col_b

            from parent_table x
           where complicated_filter_test = 'Y'
        ) p
       ,child_table c

where p.col_a = c.col_a

and p.col_b = c.col_b

Tuned properly, the time-consuming filter logic on the parent table only gets executed once per parent row instead of once per child row. I've had success trying this approach before.

And, of course, you could always put the parent_table query in a view for re-use purposes.

-----Original Message-----
From: "Duret, Kathy" <kduret_at_starkinvestments.com> Sent: Feb 2, 2005 10:55 AM
To: "Oracle L (E-mail)" <oracle-l_at_freelists.org> Subject: is there a way to return multiple cursors from a query

what I need to do is return a cursor from one query in a procedure.... no problemo

What I need to do is :

for every ID returned in the first query returned ....use this in the where condition of the child query.

Yes they want two separate cursors returned. so a function is out.

The first query is intensive so I don't want to execute it twice.

This will be executed quite a bit and returns a fair amount of data.

Thanks,

Kathy

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Received on Wed Feb 02 2005 - 14:25:50 CST