RE: Sql query

Hi Roland,

Is the query producing right results in the first place?

If there are n tables in the FROM clause, there must be atleast n-1 joins in the where clause to avoid the Cartesian product (which definitely screws up performance and rarely produces correct results.)

In the FROM clause of your query, there are 6 tables, whereas in the WHERE clause there is only 1 join condition.

HTH. Regards,
Charu

-----Original Message-----
roland.skoldblom_at_ica.se
Sent: Wednesday, February 05, 2003 6:24 PM To: Multiple recipients of list ORACLE-L

I have this sql query. I am wondering why this query takes so long time, Do I need more conditions to make it run, or it it just that this query take so long time to run? Anything wrong with the query?

Please help me with this.

 SELECT distinct PBK.VARUKORGEANREL_ULAG.ean, 0, 0, 0, rik2.vare.varenavn, rik2.vare.str, PBK.VARUKORGEANREL_ULAG.lagstapris, rik2.vare.hylletxt2, rik2.art_hierarki.vgrp, rik2.hierarki_tekst.tekst, '0', '0', 0, pbk.underlag.period,
'rsm',pbk.sortiment_vgrp.sortiment,rik2.art_hierarki.art_grp,rik2.art_hierar ki.art_ugrp

         FROM PBK.UNDERLAG, PBK.VARUKORGEANREL_ULAG, rik2.vare, rik2.hierarki_tekst, rik2.art_hierarki, pbk.sortiment_vgrp

         WHERE PBK.underlag.underlagid=1100
         AND PBK.underlag.varukorgid=PBK.varukorgeanrel_ulag.varukorgid
         AND PBK.VARUKORGEANREL_ulag.varutyp=0;

Thanks in advance

Roland

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Please see the official ORACLE-L FAQ: http://www.orafaq.net
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Author: Charu Joshi
  INET: joshic_at_mahindrabt.com

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