Hello,    The code below creates a different data set for each zipcode in my primary data set.  However, it overwrites/deletes all of the datasets except for the one created during its last iteration.  I would like for SAS to generate a unique data set for each different zipcode and save them all.  Any thoughts???   data _null_;     dcl hash hzipcode (ordered:'a');     hzipcode.definekey ('zipcode', 'state', 'city', 'year',                         'observedclosings','quarter',                         'finishedvacant','finishedsupply',                           'housinginventory','housingsupply','vdlinventory','vdlsupply',                         'underconstruction','Modelinventory','avgclosingprice','_n_');      hzipcode.definedata ('zipcode', 'state', 'city', 'year', 'observedclosings',                           'quarter', finishedvacant','finishedsupply',                           'housinginventoryy','housingsupply','vdlinventory',                           'vdlsupply','underconstruction','Modelinventory',                           'avgclosingprice');      hzipcode.definedone();        do _n_ = 1 by 1 until (last.zipcode);         set SASUSER.Ivntrysort;         by zipcode;         hzipcode.add();      end;      hzipcode.output (dataset: 'out' || put(zipcode, best.-L)); run;   Mike ... View more