Hi Rizzi,
how about a reproducible example/data.frame?
:-)
milton
On Thu, Jul 30, 2009 at 1:46 PM, <rizzo.mich...@epamail.epa.gov> wrote:
>
> Hello,
>
> I am having a problem using sqldf. I'm trying to choose a subset of
> observations from a data set based on the date and maximum value of a
> variable by date.
>
> Here is the code I am using:
>
> test<-sqldf("select distinct * from bextuse group by sdate having
> bext=max(bext)",method="raw");
>
> The result I get back is a data frame with 0 rows and 0 columns. I have
> tried the code in another program that utilizes SQL, and I retrieve the
> 14 rows I was expecting to get.
> I looked at the SQLite information on the web, and it mentions that the
> "having" clause can be used to select observations from grouped data
> using aggregating functions.
>
> Any help or advice is greatly appreciated.
>
> ______________________________________________
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> PLEASE do read the posting guide
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> and provide commented, minimal, self-contained, reproducible code.
>
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