It makes no difference at all either will do On 09/02/2011 19:20, Sytze de Boer wrote: > Hello folk > This has been really helpful > > Please may I indulge you once more > Should the select be: > > Select * From winhst Where UPPER(serno)=trcask Order By invnum Into Table > (myfile) > or > Select * From winhst Where trcask=UPPER(serno) Order By invnum Into Table > (myfile) > > > S > > > > > > On Thu, Feb 10, 2011 at 8:09 AM, Richard Kaye<[email protected]> wrote: > >> To be optimized, your WHERE clause expression needs to match an index >> expression. >> >> trcask =UPPER( the search expression) >> Select * From winhst Where UPPER(serno)=trcask Order By invnum Into Table >> (myfile) >> >> See Using Rushmore Query Optimization to Speed Data Access in the VFP help. >> >> -- >> rk >> >> >> -----Original Message----- >> From: [email protected] [mailto:[email protected]] >> On Behalf Of Sytze de Boer >> Sent: Wednesday, February 09, 2011 2:00 PM >> To: [email protected] >> Subject: VFP9 - Speed >> >> Hi foxers >> >> I have a table called WINHST >> This table has 10 indexes >> The 7th index is on a field called SERNO. Expression is upper(serno) >> >> trcask = the search expression >> Select * From winhst Where serno=trcask Order By invnum Into Table (myfile) >> >> Question 1 >> In order to speed the search, should I do the following? >> sele winhst >> set order to 7 >> Select * From winhst Where serno=trcask Order By invnum Into Table (myfile) >> >> >> Question 2 >> Does the "order by" clause slow down the select issue ? >> >> >> -- >> Regards >> Sytze de Boer >> Kiss Systems >> >> >> --- StripMime Report -- processed MIME parts --- >> multipart/alternative >> text/plain (text body -- kept) >> text/html >> --- >> [excessive quoting removed by server]
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