Microsoft SQL Server Development for Everyone - SQL MAX and MIN Aggregate Functions

The video tutorial explains how to use SQL aggregate functions, specifically MAX and MIN, to retrieve the highest and lowest grades for each course. It covers the use of the SELECT statement, WHERE clause to filter out null values, and GROUP BY clause to aggregate data by course ID. The tutorial emphasizes that aggregate functions like MAX and MIN work with numerical data and provides examples of how to apply these functions. The video concludes with a summary and encourages viewers to practice using these functions.

What is the initial step in retrieving the highest and lowest grades for each course?

• Using a JOIN clause

• Using a DISTINCT keyword

• Selecting course IDs and grades

• Applying a HAVING clause

Which SQL clause is necessary when performing aggregate functions like MAX?

• ORDER BY

• WHERE

• GROUP BY

• HAVING

What does the MAX function do in the context of this exercise?

• It calculates the average grade

• It counts the number of grades

• It finds the highest grade for each course

• It finds the lowest grade for each course

What is the purpose of the MIN function in this exercise?

• To find the highest grade

• To count the number of courses

• To find the average grade

• To find the lowest grade

Why do most aggregate functions only work with numbers?

• Because they are used for sorting data

• Because they require numeric calculations

• Because they are designed for text data

• Because they can only count occurrences