https://communities.sas.com/t5/SAS-Programming/Question-about-if-first/m-p/348104#M80563 <P>Hi, all, I try to select a subground base on if first condition, but the following simple one is not working! nothing error in the log not no any obs output! &nbsp;Anyone can help to see what's the reason? thanks&nbsp;</P><P>&nbsp;</P><P><BR />data cars_sorted;<BR />set cars;<BR />if first.Make then output;<BR />run;</P><P>&nbsp;</P><P>&nbsp;</P><P>&nbsp;</P> Fri, 07 Apr 2017 14:00:40 GMT emoryustc 2017-04-07T14:00:40Z https://communities.sas.com/t5/SAS-Programming/Question-about-if-first/m-p/348104#M80563 <P>Hi, all, I try to select a subground base on if first condition, but the following simple one is not working! nothing error in the log not no any obs output! &nbsp;Anyone can help to see what's the reason? thanks&nbsp;</P><P>&nbsp;</P><P><BR />data cars_sorted;<BR />set cars;<BR />if first.Make then output;<BR />run;</P><P>&nbsp;</P><P>&nbsp;</P><P>&nbsp;</P> Fri, 07 Apr 2017 14:00:40 GMT https://communities.sas.com/t5/SAS-Programming/Question-about-if-first/m-p/348104#M80563 emoryustc 2017-04-07T14:00:40Z https://communities.sas.com/t5/SAS-Programming/Question-about-if-first/m-p/348106#M80564 <PRE>data cars_sorted; set cars; by make; if first.Make then output; run;</PRE> Fri, 07 Apr 2017 14:03:21 GMT https://communities.sas.com/t5/SAS-Programming/Question-about-if-first/m-p/348106#M80564 PaigeMiller 2017-04-07T14:03:21Z