Complete SAS Programming Guide - Learn SAS and Become a Data Ninja - How to Join Three Tables

The video tutorial explains how to join three tables in SQL, focusing on the addition of a third table called 'backup contact' with new columns. It covers the necessary SQL code changes, including the use of aliases and the where clause for joining tables. The tutorial concludes with running the SQL code to verify correctness.

What is the purpose of adding a third table in the SQL query?

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Describe the additional column included in the backup contact table.

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What is the role of the alias in the SQL query?

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Explain the significance of the WHERE clause in the SQL query.

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How does the joining of tables enhance the SQL query's functionality?

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