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How do I index
Message
De
07/07/1999 00:20:30
 
 
À
06/07/1999 23:33:09
Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Titre:
Divers
Thread ID:
00238097
Message ID:
00238121
Vues:
13
Hi Bernard,

Consider using the following index expression: IIF(active,"1","0")+name

Then you can SEEK "1MyName" For actives with name=Myname


>I have a table with fields including a date field, a character field and a logical field that stores the deleted status of the record - .T. = current, .F. = Deleted.
>id = N(10)
>Char = Name C(30)
>Date = Birth date D(8)
>Active = L(1)
>among other fields
>
>When changes are made to a record a new record is created with the changes, Active = .T. and the active = .f. for the old record. Thus we have an audit trail of changes.
>
>How do I create an index on the character field so as to SEEK only those that are active.
>
>I use Locate for name = "MYNAME" and ACTIVE = .T. but this is too slow. I need SEEK so how do I create an index for this??
>
>Set filter to ACTIVE = .T. is also too slow. There are > 250000 records (including the non active ones)
>
>I need to
>
>Set ORDER to TAG myindextag
>and
>SEEK "MYNAME" which will give me an active record.
>
>Bernard
------------------------------------------------
John Koziol, ex-MVP, ex-MS, ex-FoxTeam. Just call me "X"
"When the going gets weird, the weird turn pro" - Hunter Thompson (Gonzo) RIP 2/19/05
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