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Always trips me up!
Message
De
14/06/2007 16:45:54
Mike Yearwood
Toronto, Ontario, Canada
 
Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Versions des environnements
Visual FoxPro:
VFP 9 SP1
OS:
Windows XP SP2
Database:
Visual FoxPro
Divers
Thread ID:
01233129
Message ID:
01233312
Vues:
19
>>>>>Just compare the speed. I am very curious which way is better. Never had enough records to make a proper tests.
>>>>
>>>>Just FYI
>>>>
>>>>Using live data (local hard drive - not on the server), running both queries 1,000 times resulted in 57.307 seconds for yours and 74.672 for Sergey's.
>>>
>>>Mike, what about my as well?
>>>
>>>How many tests did you run?
>>
>>Which was your query? This one seems like it won't work because sh.statusID cannot match CTOBIN(RIGHT(MAX(DTOS(ChangeDate)+BINTOC(StatusId )),4)?
>>
>>SELECT Mb.*, Sh.* ;
>> FROM Members mb ;
>> INNER JOIN StatusHistory sh ON Mb.MemberId = sh.MemberId ;
>> WHERE sh.StatusId IN ;
>> (SELECT CTOBIN(RIGHT(MAX(DTOS(ChangeDate)+BINTOC(StatusId )),4)) ;
>> FROM StatusHistory GROUP BY MemberId )
>
>Maybe it must be:
>
>SELECT Mb.*, Sh.* ;
>FROM Members mb ;
>INNER JOIN StatusHistory sh ON Mb.MemberId = sh.MemberId ;
>WHERE CTOBIN(RIGHT(MAX(DTOS(sh.ChangeDate)+BINTOC(sh.StatusId )),4)) IN ;
>     (SELECT CTOBIN(RIGHT(MAX(DTOS(ChangeDate)+BINTOC(StatusId )),4)) ;
>            FROM StatusHistory GROUP BY MemberId )
>
:) Maybe, but I don't want to guess.
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