Retrieving Friends of a User Along with Their Last Message Sent Between Them Using MySQL Joins and Not Exists Clause

Calculating Percentage Increase in MySQL Based on Multiple Columns Using Aggregate Functions and LEFT JOINs

Retrieving Unmatched Rows: A Step-by-Step Solution for MySQL

Optimizing Slow Queries in MySQL/MariaDB: A Deep Dive

Using Last Insert ID in Different Tables with Foreign Keys: A Comprehensive Solution for PHP and MySQL Applications

Understanding User Variables in MySQL Sessions: Avoiding Retained Values Across Sessions

Grouping Records by Time Order in SQL

Mastering GROUP BY and Correlated Subqueries: A Deep Dive into SQL's Power

Selecting Every Fourth Row in MySQL: A Mathematical Approach Using Modulus Operator

Query Optimization for MySQL: Using `MAX()` to Retrieve Distinct User Handles with IDs