Definition

[tmm]

I have this code and wonder what the dash dash signifies

proc sort nodupekey; by mem_id - - prov_eff_dt;

run;

[data_null__]

SAS Variable List

http://support.sas.com/documentation/cdl/en/lrcon/62955/HTML/default/viewer.htm#a000695105.htm

[PGStats]

It means to do the sort according to all the variables from mem_id to prov_eff_dt in the list of variables of the dataset that is getting sorted.

PG

[FloydNevseta]

It signifies a list of variables beginning with mem_id and ending with prov_eff_dt based on the order the variables were defined in the dataset. Here is the section that covers variable lists.

http://support.sas.com/documentation/cdl/en/lrcon/62955/HTML/default/viewer.htm#a000695105.htm