sqldf
is used to issue SQL statements, and have them act on data frames. iris
is not a database table, but a built-in data set.
> head(iris, n=3)
Sepal.Length Sepal.Width Petal.Length Petal.Width Species
1 5.1 3.5 1.4 0.2 setosa
2 4.9 3.0 1.4 0.2 setosa
3 4.7 3.2 1.3 0.2 setosa
sqldf
is not used to connect to databases.