Thanx guys,
practical and effective solutions.
Gianandrea
glaporta wrote:
>
> Hi,
> sqldf is a fantastic package, but when the SELECT procedure runs unused
> levels remain in the output. I tried with the drop function, but without
> success. Do you have any suggestions?
> Thanx, Gianandrea
>
> data(iris)
> require(sqldf)
> base<-sqldf("select * from iris where Species <> 'setosa'")
> str(base) # Species with 3 levels!
>
>
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