Using the same subquery in several cursors

I have a small subquery that I am currently reuse in many cursors (that he returned to about a thousand files). I was wondering if there is a better way - to a performance and a readability perspective - to go about it rather than rewrite the subquery several times in each cursor? I was thinking about a global temporary table or materialized view, but I don't know if it's necessary here / it will help with performance, because the query is so small.

Here's an example of how I currently my code wrote:
CURSOR sample_a_cur IS
WITH subquery_view AS
(
SELECT *
FROM   table
)
SELECT *
FROM   table_a ta,
       sub_query_view sqv
WHERE  ta.code = sqv.code;

CURSOR sample_b_cur IS
WITH subquery_view AS
(
SELECT *
FROM   table)

SELECT *
FROM    table_b tb,
        sub_query_view sqv
WHERE   tb.code = sqv.code;

etc....
Published by: user652714 on 10 July 2012 09:10

Hello

I guess that there are more subquery_view than what you posted. If it's really just "SELECT * FROM table_x", then you may as well use table_x in each slider.

user652714 wrote:
I have a small subquery that I am currently reuse in many cursors (that he returned to about a thousand files). I was wondering if there is a better way - to a performance and a readability perspective - to go about it rather than rewrite the subquery several times in each cursor? I thought in a global temporary table or materialized view.

How about a regular view?

CREATE OR REPLACE VIEW subquery_view
AS
SELECT  *
FROM        table_x
;

In your PL/SQL code, you can reference it as an array:

CURSOR sample_a_cur IS
    SELECT  *
    FROM    table_a          ta,
                sub_query_view      sqv
    WHERE   ta.code  = sqv.code;

CURSOR sample_b_cur IS
    SELECT  *
    FROM    table_b          tb,
            sub_query_view     sqv
    WHERE   tb.code = sqv.code;

....

You do not need to fill out or refresh the view.

but I don't know if it's necessary here / it will help with performance, because the query is so small.

You're right; It may not be important for performance.
However, the code will be easier to maintain and less likely to have bugs, if you do something, whether a regular view, materialized view, or a global temporary table, so that when you need to change sub_query_view, just make the change in one place.

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