datastep - SAS - Compare observation to previous observations? -

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i have following data:

acct        date 11111       01/01/2014 11111       01/01/2014 11111       02/02/2014 22222       01/01/2014 22222       01/01/2014 33333       01/01/2013 33333       03/03/2014 44444       01/01/2014 44444       01/01/2014 44444       01/01/2014

what best way accomplish following in sas? want compare dates each acct number , return records accts there @ least 1 date doesn't match.

so dataset above, want end following:

acct        date 11111       01/01/2014 11111       01/01/2014 11111       02/02/2014 33333       01/01/2013 33333       03/03/2014

something work. sort data acct/date if not already, check each last.date row. if first last.date row not last.acct, set of rows respondent needs output. here output 1 row per date/acct combination:

data want; set have; acct date; if (last.date) , not (last.acct) do;   flg=1;   output; end; else if last.date , flg=1 output; else if first.acct flg=0; run;

if need rows, need either take above , merge original, or dow loop:

data want; _n_=1 1 until (last.acct);  set have;  acct date;  if (last.date) , not (last.acct) do;   flg=1;  end; end; _t_ = 1 1 until (last.acct);  set have;  acct date;  if flg=1 output; end; run;

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