Aspects


vs


Plyr

Plyr is an R package with tools to solve a variety of problems using the split-apply-combine strategy

Sqldf

SQLDF is an R package for running SQL statements on R data frames.

Others

Quality Example
Faster

"In the first example sqldf is 3x slower than data.table and in the second its 200x faster than plyr and 100 times faster than data.table"

from question "What's the fastest way to merge/join data.frames in R?"

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