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SQL -- getting hourly averages of 15 minute bars
Message
General information
Forum:
Visual FoxPro
Category:
Coding, syntax & commands
Environment versions
Visual FoxPro:
VFP 9 SP2
OS:
Windows 7
Network:
Windows 2008 Server
Database:
Visual FoxPro
Application:
Desktop
Miscellaneous
Thread ID:
01593485
Message ID:
01593546
Views:
32
>
>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
>
>
>there's some stuff in here that I haven't used before, like R.* and INNER JOIN and also Mx ON R. etc.,
>so it's a little bit hard for me to debug it. Thanks. Steve

R and Mx are aliases for the Ratings table and the derived table respectfully.

I think you may need to read a bit about basic SQL features, you may start from these links

http://www.w3schools.com/sql/default.asp
If it's not broken, fix it until it is.


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