In this SAS administration tutorial Leonid Batkhan presents various SAS programming solutions on how to identify and prevent duplicate LIBREFs in SAS 9 metadata.
SAS administrator tip: How to identify and prevent duplicate librefs in SAS metadata was published on SAS Users.
This article discusses how to use SAS to filter variables in a dataset based on the percentage of missing values or duplicate values. The missing value statistics can be implemented by either DATA step programming on your own or reusing the existing powerful PROC FREQ.
How to filter variables by percentage of missing values or duplicate values in SAS was published on SAS Users.