Hi All,
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?
Thanks,
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.
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.
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