Need support for tuning query

Question

Hello people,
I have a complex question.
Imagine a supermarket where all sold products are written in a database. The sources are three cash registers. The database will continue filled with new data. I will:
- From a certain product (for example, "JAM", this product is part of a table 'products' in which these specific products are named) the data request which is received in a 30 second after the insertime product 'JAM'.
- The above action I break per cash register (cash_1, Cash_2, Cash_3).
- I want to select all products in all three subqueries occur.
As far as I have:
Select *
From db
Where product in (Select * from db where insertdate between (Select insertdate from db where product = ‘JAM’ and source = ‘Cash_1’) and ((Select insertdate from db where product = ‘JAM’ and source = ‘Cash_1’)-(sysdate-0.000347)))
and product in (Select * from db where insertdate between (Select insertdate from db where product = ‘JAM’ and source = ‘Cash_2’) and ((Select insertdate from db where product = ‘JAM’ and source = ‘Cash_2’)-(sysdate-0.000347)))
And product in (Select * from db where insertdate between (Select insertdate from db where product = ‘JAM’ and source = ‘Cash_3’) and ((Select insertdate from db where product = ‘JAM’ and source = ‘Cash_3’)-(sysdate-0.000347)))
Who can help me? I suppose that this query will very tuff for the server. Are there any ways to tune this query up? I like to hear from you.
Aldert
Edited by: user11315153 on 30-jun-2009 0:51

Answer 1

As far as I can see the query is
SELECT *
  FROM db
WHERE product IN
             (SELECT *
                FROM db
               WHERE insertdate BETWEEN (SELECT insertdate
                                           FROM db
                                          WHERE product = 'JAM'
                                                AND source = 'Cash_1')
                                    AND  ( (SELECT insertdate
                                              FROM db
                                             WHERE product = 'JAM'
                                                   AND source = 'Cash_1')
                                          - (SYSDATE
                                             - 0.000347)))
       AND product IN
                (SELECT *
                   FROM db
                  WHERE insertdate BETWEEN (SELECT insertdate
                                              FROM db
                                             WHERE product = 'JAM'
                                                   AND source = 'Cash_2')
                                       AND  ( (SELECT insertdate
                                                 FROM db
                                                WHERE product = 'JAM'
                                                      AND source = 'Cash_2')
                                             - (SYSDATE
                                                - 0.000347)))
       AND product IN
                (SELECT *
                   FROM db
                  WHERE insertdate BETWEEN (SELECT insertdate
                                              FROM db
                                             WHERE product = 'JAM'
                                                   AND source = 'Cash_3')
                                       AND  ( (SELECT insertdate
                                                 FROM db
                                                WHERE product = 'JAM'
                                                      AND source = 'Cash_3')
                                             - (SYSDATE
                                                - 0.000347)))which would probably suffer from a »ORA-00913: too many values«, because you can't do »..where product in (select * from ....)« (if db has more than one column).
It would be better to provide table structures - db version - and to formulate what you actually want to achieve.