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SQL update syntax
Message
De
21/11/2006 10:01:49
 
 
À
21/11/2006 09:33:22
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:
01171410
Message ID:
01171421
Vues:
7
Hmm. what is Kmtr.MaxKm??? SQL and I are confused :))

>>Hi!
>>
>>I have table kilometri with 3 fields:
>>ID, datum, stanjekm.
>>
>>I want to update another table with stanjekm for max date which is less then some other date...
>>Here is code which work, but update for max stanjekm. This work, but when someone change km meter in his car, I get wrong result, of course....
>>How to get stanjekm for max datum, but less then ldDatod?
>>
>>
>>Update RptTjedniKm ;
>>	Set Startkm = (Select Max(kilometri.stanjekm) From kilometri ;
>>	where RptTjednikm.ID = kilometri.ID AND kilometri.datum < ldDatod )
>>
>>
>>Branko
>
>Try:
>
>Update RptTjedniKm ;
>	Set Startkm = Kmtr.MaxKm;
>FROM RptTjedniKm;
>INNER JOIN (Select kilometri.ID, Max(kilometri.stanjekm);
>                   From kilometri;
>                   GROUP BY Id WHERE datum < ldDatod) Kmtr;
>ON RptTjednikm.ID = Kmtr.ID
>
>
>Make a good backup first :-)
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