database first - Adding foreign key in visual studio 2012 - Stack Overflow
MySQL Foreign Key
Create A Relationship - SQLyog Knowledge Base
Javarevisited: Difference between Primary key vs Foreign key in table – SQL Tutorial Example
How to create a SQL Server foreign key
MySQL Foreign Key - javatpoint
SQL FOREIGN KEY Constraint (With Examples)
How to add Foreign key Constraint to existing table in SQL Server-SQL Server/TSQL Tutorial Part 68 - YouTube
How to set foreign key to a related table? - Queries and Resources - Retool Forum
PostgreSQL Foreign key - A Beginner's Guide
SQL FOREIGN KEY - Scaler Topics
Setting foreign key in phpMyAdmin - Databases - SitePoint Forums | Web Development & Design Community
database design - MySQL permits setting a foreign key constraint that references only one column of a composite primary key - Database Administrators Stack Exchange