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SQL command: syntax needed
Message
De
22/03/2004 14:04:41
 
 
À
22/03/2004 10:37:33
Bruno Maddalozzo
Informatica Aziendale
Arsie, Italie
Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Divers
Thread ID:
00888526
Message ID:
00888610
Vues:
13
>I need a query to extract the most recent price inserted for a product
>i.e.
>
>
>id_product    year   price
>1             2004   12004
>1             2003   12003
>2             2003   22003
>2             2002   22002
>
>
>so as to obtain
>
>id_product    year   price
>1             2004   12004
>2             2003   22003
>
>
>
>Which is the SQL syntax to perform the Select?

YOu need to do this in two steps:

SELECT id_product, MAX(year) AS MostRecent ;
FROM YourTable ;
GROUP BY 1 ;
INTO CURSOR Recent

SELECT id_product, Year, Price ;
FROM YourTable ;
JOIN Recent ;
ON YourTable.id_product = Recent.Id_product ;
AND YourTable.Year = Recent.MostRecent ;
INTO CURSOR Result

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