What is a composite primary key, and how to create one in phpMyAdmin
KB-1413 MySQL Best Practices - Primary Key or unique index on every table - Appian Knowledge Base - Support - Appian Community
mysql - How do I change the definition of a primary key column that's involved in a botched foreign key constraint? - Database Administrators Stack Exchange
Primary and foreign keys in MySQL projects - Datensen
SQL Query to Check or Find the Column Name Which Is Primary Key Column - GeeksforGeeks
Simple Ways to Choose a Primary Key in a Database: 4 Steps