Message
From
12/04/2010 20:59:56
To
12/04/2010 20:55:24
Environment versions
Visual FoxPro:
VFP 9 SP1
Miscellaneous
ID da thread:
01459829
ID da mensagem:
01459839
Views:
61
>>>>>An index on pkfield ought to do it.
>>>>>
>>>>>What data type is pkfield?
>>>>
>>>>Correction. The field is Numeric(6,0) but there is an index tag on this field. Yet, Rushmore is not used.
>>>
>>>Try
>>>
>>Nope. This does not work either.
>
>What about just
>
>select top 100 pkField from myTable ORDER BY PkField DESC ?
>
>Also ORDER BY is not guaranteed to be optimizable. It's VFP engine that decides if it wants to optimize it or not.
I am changing my approach to this design. Thanks.
>>>>>
>>>>>What data type is pkfield?
>>>>
>>>>Correction. The field is Numeric(6,0) but there is an index tag on this field. Yet, Rushmore is not used.
>>>
>>>Try
>>>
>>>select * from myTable where pkfield IN (select top 100 pkfield from myTable order by pkfield DESC)>>
>>Nope. This does not work either.
>
>What about just
>
>select top 100 pkField from myTable ORDER BY PkField DESC ?
>
>Also ORDER BY is not guaranteed to be optimizable. It's VFP engine that decides if it wants to optimize it or not.
I am changing my approach to this design. Thanks.
"The creative process is nothing but a series of crises." Isaac Bashevis Singer
"My experience is that as soon as people are old enough to know better, they don't know anything at all." Oscar Wilde
"If a nation values anything more than freedom, it will lose its freedom; and the irony of it is that if it is comfort or money that it values more, it will lose that too." W.Somerset Maugham
"My experience is that as soon as people are old enough to know better, they don't know anything at all." Oscar Wilde
"If a nation values anything more than freedom, it will lose its freedom; and the irony of it is that if it is comfort or money that it values more, it will lose that too." W.Somerset Maugham