13 MySQL Built in, User Defined Functions

Level up your SQL skills in MySQL with this hands‑on tutorial covering built‑in and user‑defined functions! In this lesson, you’ll learn how to use MySQL functions to transform data, automate calculations, and create reusable code for optimized querying and reporting.

What you’ll learn:

The role of functions in SQL/MySQL—including how they work inside SELECT, WHERE, HAVING, and more

Categories and practical examples of built‑in functions: String (CONCAT, LENGTH), Numeric (ROUND, MOD), Date/Time (DATEDIFF, DATE_FORMAT), Aggregate (SUM, AVG, COUNT), and Control Flow (IF, CASE)

How to create your own User-Defined Functions (UDFs) for custom business logic, including syntax, best practices, and live demos (cubing a value, calculating age from DOB, and more)

Managing functions—listing, dropping, and keeping your database organized

Recap tips for writing clear, efficient functions in real‑world databases

Whether you’re a beginner, analyst, developer, or preparing for interviews, mastering MySQL functions will save you time, boost report accuracy, and streamline your workflow.

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