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Integer/date compound index
Message
De
28/06/2007 12:02:31
Cetin Basoz
Engineerica Inc.
Izmir, Turquie
 
 
Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Divers
Thread ID:
01236371
Message ID:
01236439
Vues:
12
>>>>Actually, I think that is a good question.
>>>>I'm trying to create a relationship between two tables through record ids, but I want the child table to be in reverse date order.
>>>>
>>>>Do you think I going about it correctly?
>>>
>>>In your current task description you're correct. If, for example, you would want a key based on a numeric field (not integer) in ascending order
>>>and a date in descending order, you would use something like:
>>>
>>>
padl(myNumField,10,'0') + padl({^9999-01-01} - DateField),10,'0')
>>>
>>>The idea was discussed long time ago here as well.
>>>
>>>But it would not work for NULL and empty dates, so the index expression should be a little bit more complex...
>>
>>No need for tricky expressions:) bintoc()+dtos(), descending.
>>Cetin
>
>I've changed the original problem definition, didn't you see the description of a new problem I was trying to solve?
>
>Thanks.

Integer to numeric? Then padl(myNumField,10,'0')+dtos(). Numerics didn't sound as an id to me and couldn't determine such a usage.
Cetin
Çetin Basöz

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