On Mon, Feb 10, 2014 at 1:56 PM, Petite Abeille
<petite.abei...@gmail.com> wrote:
>
> On Feb 10, 2014, at 7:39 PM, Gabor Grothendieck <ggrothendi...@gmail.com> 
> wrote:
>
>> That should have read right join.
>
> My personal opinion? Anyone even considering using a right outer join should 
> be cursed into repeating their first day at high school. For ever. Groundhog 
> Day, The High School Years.
>

Right joins are important since they generalize subscripting.  For
example, if X and Y are data tables (created using the R data.table
package) then X[Y] is a right join of X and Y.
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