Microsoft SQL Server Development for Everyone - SQL AVG Aggregate Function

This video tutorial covers the use of the AVG aggregate function in SQL, focusing on calculating average grades. It begins with a database structure change to accommodate numerical grades, followed by a detailed explanation of handling design changes safely. The tutorial then demonstrates how to use aggregate functions and SQL queries to calculate averages, including filtering and ordering results. Key concepts such as the use of the GROUP BY clause and handling NULL values are also discussed.

What happens if you try to group by a column that is being aggregated?

How can you order the results of an SQL query based on an aggregate function?

What steps should be followed to filter results based on an aggregated value?

Why is it important to ensure that all non-aggregated columns are included in the GROUP BY clause?