Union - Function Summary
Creates a new set that is the union of the two arguments.
union set1 set2
set1 - first set (must be: series bitset)
set2 - second set (must be: series bitset)
/case - Use case-sensitive comparison
/skip - Treat the series as records of fixed size
size - The size argument. (must be: integer)
Returns all elements present within two blocks or strings ignoring the duplicates.
To obtain a unique set (to remove duplicate values) you can use UNIQUE.
Note that performing this function over very large data sets can be CPU intensive.