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15/02/2010 14:24:25
 
 
Information générale
Forum:
Visual FoxPro
Catégorie:
Codage, syntaxe et commandes
Titre:
Versions des environnements
Visual FoxPro:
VFP 9 SP2
Divers
Thread ID:
01449210
Message ID:
01449218
Vues:
44
>>>The following is very slow, presumably because of my use of IN
Select * From KTrackTagDetail							;
>>>	where (Seqno In (Select Seqno From C_Kits)			;
>>>	or SeqnoFG In (Select Seqno From C_Kits))			;
>>>	and Left (RecordType,2) # 'AP'						;
>>>	into Cursor C_Detail
>>>So, how can I speed this up?
>>>
>>>Thanks
>>
>>
>>Try ONE left join insstead of two select queries
>>
>>
>>Select * From KTrackTagDetail ;
>>	left join C_Kits on (  KTrackTagDetail.Seqno ==  C_Kits.Seqno ) ;
>>		or    (  KTrackTagDetail.SeqnoFG ==  C_Kits.Seqno ) ;
>>	where (  Left (RecordType,2) # 'AP' ) ;
>>	    and ( C_Kits.Seqno is not null )
>>
>
>LEFT JOIN is not the same as IN condition. This is not equavalent to the original query.

Who cares - it'll probably run faster - with the same results
Gregory
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