Hi,
As per your code, the data set 'a' won't be ceated because there is no data set exists without observations.
Are you looking to update the observations present in data set 'a' with the observations present in data set 'b' .Make your task clear so that I may helpful for you.
2025 SAS Hackathon: There is still time!
Good news: We've extended SAS Hackathon registration until Sept. 12, so you still have time to be part of our biggest event yet – our five-year anniversary!