10-18-2016 07:05 AM - edited 10-18-2016 07:06 AM
A declarative statement is one that is acted upon during data step compilation.
Their placement within the data step is more or less without effect.
Other statements are executable and will cause action during data step execution.
The set statement somehow falls into both categories; for one, it causes the compiler to read the structure from the dataset(s) and put variables into the PDV; OTOH, it also marks the place within the data step where a read from the dataset(s) happens.
The declarative element with thise statement is the fact that the dataset(s) cannot change during data step execution.
Infiles and outfiles (infile and file statements) can change dynamically during execution.