[R] drop unused levels in sqldf

[glaporta]

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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