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What is the most efficient way to drop/keep columns (variables) in sas tables (data sets)?For the most part, we would correctly say “using a keep= option on the data set as it is being read into the current step.” A quick example to illustrate: data someData; set myData(keep= x y z); run; proc sort data = myData(keep= x y z) out= someData; by x y; run;In fact, I even wrote a whole paper
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