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 main focus when joining three tables in SQL?

• Learning a new programming language

• Ensuring data integrity

• Understanding complex algorithms

• Simplifying the process with slight modifications

What is the purpose of the 'backup contact' table in the SQL query?

• To add additional contact information

• To manage employee work schedules

• To store employee addresses

• To keep a record of employee salaries

What is the significance of using an alias for the new table?

• To shorten the query

• To improve query performance

• To avoid confusion with other tables

• To enhance data security

In the WHERE clause, what is the key condition for joining the tables?

• Matching employee names

• Matching employee IDs

• Matching department codes

• Matching phone numbers

What is the final step after setting up the SQL join?

• Reviewing the data types

• Running the query to check correctness

• Optimizing the query for speed

• Backing up the database