Hi, I have a data set as;   Id   Date 1    2005 2    2008 3    2004 3    2012 4    2001 5    2016 5    2007 5    2010   I want to order the data so that it is sorted by date order, but keep the same id's together, so it would look like this;   Id   Date 4    2001 3    2004 3    2012 1    2005 5    2007 5    2010 5    2016 2    2008   The only way i have found to do his so far is using proc sort, but this seems to either order by date which muddles the ids, or I can sort by dates within id but this doesn't reorder the id's so that the earliest is first.   Any help is really appreciated, thanks in advance 🙂  ... View more