Microsoft SQL Server Development for Everyone - SQL COUNT Aggregate Function

The video tutorial covers using SQL to count the number of students enrolled per course. It begins with setting up a basic query to select data from the enrollments table, focusing on course and student IDs. The tutorial then explains using aggregate functions to count students and the necessity of grouping by course ID. Finally, it demonstrates enhancing the query output with inner joins and formatting for better presentation.

What is the primary goal when counting students enrolled per course in SQL?

• To filter courses by name

• To list all students in alphabetical order

• To display course details

• To count the number of students for each course

Which SQL function is used to count the number of students per course?

• COUNT

• MIN

• AVG

• SUM

Why is the GROUP BY clause necessary when using aggregate functions?

• To sort the results

• To filter out duplicates

• To aggregate data by specific columns

• To join multiple tables

What additional details were included in the query to enhance the output?

• Enrollment dates

• Instructor names

• Course code and title

• Student names and ages

What is the purpose of formatting the query output for reporting?

• To reduce the size of the output

• To increase the execution speed

• To make it easier to read and present

• To hide sensitive information