Re: is there a way to return multiple cursors from a query
- From: david wendelken <davewendelken@xxxxxxxxxxxxx>
- To: "Oracle L (E-mail)" <oracle-l@xxxxxxxxxxxxx>
- Date: Wed, 2 Feb 2005 11:22:48 -0800 (PST)
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@xxxxxxxxxxxxxxxxxxxx>
Sent: Feb 2, 2005 10:55 AM
To: "Oracle L (E-mail)" <oracle-l@xxxxxxxxxxxxx>
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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