[R] R is not for Relational
R.E.Darnell at newcastle.ac.uk
Wed Aug 4 10:24:19 CEST 1999
Russel Senior writes:
>One useful thing that subset() doesn't appear to do is joins. That is
>frequently what select statements are used for in SQL. There are
>three S-plus functions (at least, as documented in MASS 2ed) called
>merge, by and aggregate. The merge() function joins data frames, but
>is not implemented in R that I am aware of, at least as of 0.64.0.
I use match to merge data sets.
is similar to
SELECT V1 V2
FROM A B
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