Question

MySql Subquery problem

Asked by: g-spot

I have a MySQL query that calls records based on a sub query. However the query takes forever to execute.

I know that the subquery works fine and returns its records (approx 32) almost instantly.

But when combined with the outer query, the query never returns a result (or takes longer than Im prepared to wait)

SELECT l.vch_code, l.vch_name FROM ocs.logins l WHERE l.int_id IN
    (SELECT DISTINCT int_brokercode FROM ocs.livepolicies lp LEFT JOIN ocs.types ON lp.int_policytype = types.int_id
    WHERE MONTH(date_end) = '6' AND YEAR(date_end) = '2009' AND types.set_annual = 'y' AND set_void = 'false')
ORDER BY l.vch_code ASC

                                  
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Asked On
2009-06-08 at 03:35:42ID24471607
Tags

SQL MySQL

Topics

MySQL Server

,

SQL Query Syntax

Participating Experts
2
Points
250
Comments
3

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Answers

 

by: pcelbaPosted on 2009-06-08 at 03:43:57ID: 24570503

You could try to change the IN operator to INNER JOIN (if MySQL allows it):

SELECT l.vch_code, l.vch_name 
  FROM ocs.logins l 
  INNER JOIN 
      (SELECT DISTINCT int_brokercode 
         FROM ocs.livepolicies lp 
         LEFT JOIN ocs.types ON lp.int_policytype = types.int_id
        WHERE MONTH(date_end) = '6' 
          AND YEAR(date_end) = '2009' 
          AND types.set_annual = 'y' 
          AND set_void = 'false') brok ON l.int_id = brok.int_brokercode
 ORDER BY l.vch_code ASC
                                              
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by: pratima_mcsPosted on 2009-06-08 at 03:52:18ID: 24570533

SELECT l.vch_code, l.vch_name FROM ocs.logins l WHERE l.int_id IN
    (SELECT DISTINCT int_brokercode FROM ocs.livepolicies lp LEFT JOIN ocs.types ON lp.int_policytype = types.int_id
    WHERE MONTH(date_end) = '6' AND YEAR(date_end) = '2009' AND types.set_annual = 'y' AND set_void = 'false')
ORDER BY l.vch_code ASC


In this check is there any this matching   l.int_id  and   int_brokercode   ???

Ithin it must be l.vch_code = int_brokercode


SELECT l.vch_code, l.vch_name FROM ocs.logins l WHERE l.vch_code IN
    (SELECT DISTINCT int_brokercode FROM ocs.livepolicies lp LEFT JOIN ocs.types ON lp.int_policytype = types.int_id
    WHERE MONTH(date_end) = '6' AND YEAR(date_end) = '2009' AND types.set_annual = 'y' AND set_void = 'false')
ORDER BY l.vch_code ASC

 

by: g-spotPosted on 2009-06-08 at 05:35:35ID: 24571134

Hi Pratima

l.vch_code is a string so it definitely should be l.int_id = int_brokercode.

Thanks

20120131-EE-VQP-002

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