Exploring the Most Useful SQL Operators, Functions, and Clauses
<p>Hey, there! I’m Gabe, and I am passionate about teaching others about Artificial Intelligence and Machine Learning.</p>
<p>Today, I want to dive into the world of SQL functions, those powerful tools that can make your data analysis tasks a breeze.</p>
<p><strong>Whether you’re a seasoned data analyst or just starting to explore the world of databases, understanding SQL functions and how to use them can significantly enhance your efficiency and productivity.</strong></p>
<h1>Section 1: COUNT, SUM, and AVG — The Basic Trio</h1>
<blockquote>
<p>How can I easily count, sum, and average my data?</p>
</blockquote>
<p>When you’re working with large datasets, counting the number of rows, calculating sums, and finding the average of a column is a fundamental requirement. Thankfully, SQL provides us with some handy functions to accomplish these tasks with ease.</p>
<p>The <code>COUNT</code> function returns the number of rows that match a specific condition or criteria. For example, let's say you have a table called "Orders," and you want to count the number of orders placed by a particular customer:</p>
<pre>
SELECT COUNT(*) AS TotalOrders
FROM Orders
WHERE CustomerID = '12345';</pre>
<p>The <code>SUM</code> function, as the name implies, calculates the sum of all values in a given column. Let's say you have a table called "Sales" with a column called "Revenue," and you want to calculate the total revenue:</p>
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