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.

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