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08.04.2008 at 12:34AM PDT, ID: 23618271
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8.0

Conditions in joins

Asked by hernst42 in SQL Query Syntax, Oracle Database

Tags: ,

Hi,
I have a rather theoretical/practical questions. When I use the SQL shown in the snippet I get database errors because the database is doing a full table scan, applying the function to each row and the function fails, because it tries to convert strings to numbers. There is an additional condition (the one used in the join) which would filter out those invalid rows.

If I put the join condition additional into the where I don't get database errors.

So do I build the SQL wrong?
Does the optimizer does to much what he shouldn't?
Which priority do the conditions in the JOIN have over the ones specified in the WHERE?
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select distinct v0."LK" as "Lkey" from dt0 v0
 inner join dt0v v1 on (v1."Field"=103533 and v1."FK_LK"=v0."PK") 
 inner join ACLEntry acl30 on (acl30."FK_ACL"=v0."FK_ACL") 
WHERE ((acl30."FK_ACL"=v0."FK_ACL")) and ((((TO_NUMBER(v1."Value")=3.0))) and ((acl30."FK_Benutzer"=1 or acl30."FK_Gruppe" IN (6 , 1 , 2)) and acl30."Type"=\'r\') and v0."histtop"=\'Y\')  ORDER BY v0."LK" desc
 
WHERE (v1."Field"=103533 and v1."FK_LK"=v0."PK") AND ((acl30."FK_ACL"=v0."FK_ACL")) and ((((TO_NUMBER(v1."Value")=3.0))) and ((acl30."FK_Benutzer"=1 or acl30."FK_Gruppe" IN (6 , 1 , 2)) and acl30."Type"=\'r\') and v0."histtop"=\'Y\')  ORDER BY v0."LK" desc
[+][-]08.04.2008 at 12:43AM PDT, ID: 22150554

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Zones: SQL Query Syntax, Oracle Database
Tags: SQL, join where, oracle
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Solution Provided By: schwertner
Participating Experts: 2
Solution Grade: A
 
 
[+][-]08.04.2008 at 12:44AM PDT, ID: 22150557

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[+][-]10.17.2008 at 03:11PM PDT, ID: 22745824

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[+][-]10.25.2008 at 07:13AM PDT, ID: 22803333

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