Data Analyst Tutorial #20 SQL Aggregate Functions Explained with Real-Life Example

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Welcome back to the Data Analyst Tutorial Series!
In this 20th video, we dive deep into SQL Aggregate Functions—one of the most powerful tools for summarizing and analyzing large datasets.

To make this concept easy and relatable, we revisit the inspiring story of Mrs. Harper, a librarian managing thousands of books using a digital SQL catalog.
She wants to answer important questions like:

How many total books are in the library?
What is the average publication year?
Which is the oldest or newest book?
To solve these questions, she uses SQL Aggregate Functions such as COUNT(), AVG(), MIN(), and MAX().

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