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LEFT JOIN and complex criteria
Message
From
25/09/2006 15:44:26
 
General information
Forum:
Visual FoxPro
Category:
Databases,Tables, Views, Indexing and SQL syntax
Environment versions
Visual FoxPro:
VFP 9 SP1
OS:
Windows XP
Database:
Visual FoxPro
Miscellaneous
Thread ID:
01156530
Message ID:
01157075
Views:
23
>>>>I have trust in this
>>>>
>>>>SELECT TI.cTrans_fk, TI.cInsurances_fk;
>>>>    FROM (select curTemp.cTrans_pk , max(T.iSequence_Number) iSequence_Number;
>>>>	    	from curTemp JOIN Trans_Insurances T ON curTemp.cTrans_pk = T.cTrans_fk ;
>>>>		    GROUP BY 1) X ;
>>>>		    JOIN Trans_Insurances TI ;
>>>>                 ON TI.cTrans_fk = X.cTrans_pk AND TI.iSequence_Number = X.iSequence_Number;
>>>> into cursor curTemp1
>>>>
>>>
>>>Seems to be a little bit faster, but still quite slow...
>>
>>post sys(3054) and current exec time
>
>Time: 3.804
>SELECT TI.cTrans_fk as cTrans_pk, ;
>TI.cInsurances_fk ;
>FROM (select curTemp.cTrans_pk, max(T.iSequence_Number) iSequence_Number ;
>from curTemp JOIN Trans_Insurances T ;
>ON curTemp.cTrans_pk = T.cTrans_fk GROUP BY 1) X ;
>JOIN Trans_Insurances TI ;
>ON TI.cTrans_fk = X.cTrans_pk AND ;
>TI.iSequence_Number = X.iSequence_Number into cursor curTemp1
>
>Rushmore optimization level for intermediate result: none
>Rushmore optimization level for table t: none
>Joining intermediate result and table t using index tag Ctrans_fk
>Rushmore optimization level for intermediate result: none
>Rushmore optimization level for table ti: none


Joining intermediate result and table ti using temp index && !!!! temp index !!!!!
>
>I'm running everything locally with SET DELETED ON.

for testing try and post sys(3054)
SELECT TI.cTrans_fk as cTrans_pk, ;
TI.cInsurances_fk ;
FROM (select curTemp.cTrans_pk, max(T.iSequence_Number) iSequence_Number ;
from curTemp JOIN Trans_Insurances T ;
ON curTemp.cTrans_pk = T.cTrans_fk GROUP BY 1) X ;
JOIN Trans_Insurances TI ;
ON TI.cTrans_fk = X.cTrans_pk into cursor curTemp1

*expected
Rushmore optimization level for intermediate result: none
Rushmore optimization level for table t: none
Joining intermediate result and table t using index tag Ctrans_fk
Rushmore optimization level for intermediate result: none
Rushmore optimization level for table ti: none
Joining intermediate result and table ti using index tag Ctrans_fk
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