Understanding the MySQL Performance Issue on Simple Join with No Indexes

Understanding the Impact of the Cartesian Product in SQL Joins

Joining Tables with Array Type Resulting in Array Column: A PostgreSQL Solution

Selecting the Last Register in a Join: Advanced SQL Techniques for Efficient Querying

Comparing Two Tables with the Same ID and Listing Out the Maximum Date

Uniting Two Statements in SQL: A Comprehensive Guide to JOINs and Subqueries

How to Convert SQL Subqueries into Efficient Join Clauses