[R] Using !is.na() in a HAVING clause in sqldf() XXXX

[Alex Gilgur]

"having" is right; use "HAVING Premie IS NOT NULL" instead.  The sqldf 
package has a SQLite database running behind it.  All NA get internally 
converted to NULL, which is the standard representation for N/A in SQL, and 
then they become <NA> in the data.frame that is returned by the sqldf 
command

Cheers!.

On Tuesday, January 17, 2012 1:03:20 PM UTC-8, Dan Abner wrote:
>
> Hi everyone,
>
> I have the following:
>
> sqldf("select Premie,count(tpounds) N,avg(tpounds) Avg_Weight,
>   stddev_samp(tpounds) StdDev
>   from children
>   group by Premie
>   having !is.na(Premie)")
>
> sqldf() does not like the !is.na(Premie) specification. How does one
> exclude a "missing" group in an aggregated query using sqldf()?
>
> Thanks!
>
> Dan
>
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