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SQL -- getting hourly averages of 15 minute bars
Message
 
Information générale
Forum:
Visual FoxPro
Catégorie:
Codage, syntaxe et commandes
Versions des environnements
Visual FoxPro:
VFP 9 SP2
OS:
Windows 7
Network:
Windows 2008 Server
Database:
Visual FoxPro
Application:
Desktop
Divers
Thread ID:
01593485
Message ID:
01593544
Vues:
31
>I am getting a "syntax error" when I try the above, namely
>
>
>select R.* from Ratings R INNER JOIN (select Account, max(mRating) as MaxRatingForAccount from Ratings GROUP BY Account) Mx 
>ON R.Account = Mx.Account and R.mRating = Mx.MaxRatingForAccount
>
What is your VFP version?

Derived tables were added in VFP9. Prior to that you need to use 2 steps. Do the first (inner) select into a cursor and then join with that cursor.
If it's not broken, fix it until it is.


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