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15/02/2010 14:17:18
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:
01449215
Vues:
53
>>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.
If it's not broken, fix it until it is.


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