Complete SAS Programming Guide - Learn SAS and Become a Data Ninja - How to Perform a Left/Right Join

The video tutorial explains the concepts of left and right joins in SQL using two tables: 'IDF name' and 'Contact Info'. It covers the syntax for performing these joins, highlighting the differences in how each join handles unmatched rows. The left join includes all rows from the left table and matching rows from the right, while the right join includes all rows from the right table and matching rows from the left. The tutorial also discusses common errors and how to avoid them when using these joins.

In the context of the provided text, what are the two tables being joined?

Why might you receive an error when including the same column from both tables in a join?