sas - randomly select two observation and calculate the distance -

i have data set have numerical column x. want randomly select 2 distinct points , calculate distance between them.

if once, use proc surveyselect generate data set 2 obs.

proc surveyselect data=have out=want method=srs sampsize=2; run;  data out; set have end=eof; dist = abs(dif1(x)); if eof; run; 

but how can multiple times, 1000000? each time 2 points selected equal prob, have 1000000 dist records.

how reorder input dataset random order , calculate distance every second observation?

proc sql ; create table random      select *, ranuni(0) randorder     have     order randorder ;quit ;  data want ;   set random;   dist=abs(dif1(x)) ;   if _n_/2=int(_n_/2) ; run;  

if need specify specific number of samples calculate can add update set random set random(obs=100000) example. although note 'sample pairs' 100,000 give want dataset 50,000 observations