set or merge

by id_variable

if the original files are SAS datasets, use set (but not merge) or proc append(select the largest file as base would be faster than set) ;

if the original files are external files, use infile with filevar (Reference: SAS online tutor 9.1: Advanced Programming, Page 677 -- combining data vertically)

[此贴子已经被作者于2008-11-11 4:22:49编辑过]