Complete SAS Programming Guide - Learn SAS and Become a Data Ninja - How to Compare Tables with SAS SQL

The video tutorial explains how to compare two staff tables using SQL to identify changes. It introduces the concept of using the EXCEPT operator to find new hires by comparing an old table with a new one. The tutorial provides a practical example, demonstrating how to execute SQL queries to efficiently detect differences between large datasets, highlighting the importance of this method in managing extensive data.

What is the primary difference between the staff one and staff two tables?

• Staff two is a table with salaries only.

• Staff one is an old table with employee details.

• Staff two contains employee IDs only.

• Staff one contains new hires.

Which SQL operator is used to find differences between two tables?

• EXCEPT

• JOIN

• INTERSECT

• UNION

What does the 'EXCEPT' operator do in SQL?

• Combines rows from two tables.

• Returns rows from the first query not in the second.

• Deletes rows from the first table.

• Finds common rows between two tables.

In the given example, which names were identified as new hires?

• Steve and Rachel

• Paul and Linda

• Glenn and Jessica

• John and Mary

Why is the 'EXCEPT' operator particularly useful for large datasets?

• It speeds up data entry.

• It reduces the size of the dataset.

• It helps in visualizing data.

• It simplifies finding differences without manual comparison.