Microsoft SQL Server Development for Everyone - SQL SUM Aggregate Function

The video tutorial explains how to use the sum aggregate function in SQL to calculate the total number of credits each student is taking. It begins by outlining the scenario and the need to gather data from multiple tables: enrollments, students, and courses. The tutorial then demonstrates how to construct a query using inner joins to combine data from these tables. It further explains the use of the group by clause to organize data by student and the sum function to aggregate the total credits. The video concludes by encouraging viewers to experiment with the provided script file.

Explain the process of joining tables as described in the text. Which tables are involved?

What steps are taken to ensure that the output shows the total number of credits for each student?

How does the grouping of data affect the results of the query according to the text?

What is the primary purpose of the aggregate function 'sum' in the context of the provided text?

What considerations must be made regarding the 'group by' clause when using aggregate functions?