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How to implement a "select distinct x, count(distinct y) ... group by x" for a data frame

Dimitri Shvorob

Sat, Jan 23, 2010 4:59 PM

sqldf answered my prayers and more. Thanks a lot!

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Thread (4 messages)

Dimitri Shvorob How to implement a "select distinct x, count(distinct y) ... group by x" for a data frame Jan 23 jim holtman How to implement a "select distinct x, count(distinct y) ... group by x" for a data frame Jan 23 Gabor Grothendieck How to implement a "select distinct x, count(distinct y) ... group by x" for a data frame Jan 23 Dimitri Shvorob How to implement a "select distinct x, count(distinct y) ... group by x" for a data frame Jan 23