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Is it possible to speed this loop and/or SQL up?
Message
De
21/03/2005 09:40:36
Hilmar Zonneveld
Independent Consultant
Cochabamba, Bolivie
 
 
À
21/03/2005 09:35:54
Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Versions des environnements
Visual FoxPro:
VFP 7 SP1
OS:
Windows XP SP2
Database:
Visual FoxPro
Divers
Thread ID:
00997258
Message ID:
00997807
Vues:
9
Perhaps a more traditional SEEK would be faster? Seeking on the compound index.

>Hilmar
>
>Thanks a lot again but I'm afraid that made no noticeble difference, i.e. it's still taking longer than the age of the Earth to run. I tried as below. The table's composite key comprises: RTE_NO + Rte_Let + DIRECTN
>I did find out why one attempt seemed to go so fast though, on Friday. Note the second commented out line; it has a continuation ";" at the end, so the compiler was just ignoring the SQL as comment and it wasn't being done (I left it in to show - in the run it wasn't there of course).
>
>So back to the drawing board ...
>
>Terry
>...
>
>* and	PADR( RZStop.County, 2)							= lcCounty ;
>* and	not EMPTY( RZStop.TIME) ;
>  Select DISTINCT TIME from	RZStop ;
>  where 	PADR( RZStop.RTE_NO, 6) + RZStop.Rte_Let + RZStop.DIRECTN + STR( RZStop.Number, 3) + ;
>         PADR( RZStop.Stop, 8) + PADR( RZStop.County, 2) = ;
>  	lcRteNo		      + "A"	    + lcDirectn	   + lcNumber + ;
>         lcStopNo		   + lcCounty ;
> 	and	not EMPTY( RZStop.TIME) ;
> 	to SCREEN NOCONSOLE  && Find any time value for this particular stop across all other sequences
>
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)
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