10-20-2016 10:10 PM
In which senario we should use proc sql over data step while merging two dataset? If I have a dataset with 2 million records and other has only 200 records. which method should I use while joining these two tables?
10-20-2016 11:18 PM
The choice usualy depends on the result you want:
It might also depend on your skill with the DATA step vs. SQL.
The bottom line is you have to describe the inputs and outputs at least a little bit.
10-20-2016 11:29 PM
There's no hard and fast rule. And it isn't only between SQL and data step, hash objects and formats can also be options for lookups.
In general, a many to many merge is often best done in SQL. Everything else has multiple options.