Chapter 8: Data Sources
In the DATA step, you have three fundamental data sources:
1. The SET statement reads existing tables.
2. The MERGE statement reads and matches or merges existing tables.
3. The INPUT statement reads raw text files.
Both SET and MERGE operate on tables or views. The tables and views can come from a variety of sources, but they are always tables or views that have already been defined. With data set options, you can control which columns should ...