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InterBase Add Foreign Key to InterBase Database Tables via the Alter Table Command
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SQL SERVER - 2008 - Creating Primary Key, Foreign Key and Default Constraint - SQL Authority with Pinal Dave
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SQL FOREIGN KEY: How to Create in SQL Server with Example
SQL Query to Add Foreign Key Constraints Using ALTER Command - GeeksforGeeks
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Teradata Add Foreign Key to Teradata Database Tables via the Alter Table Command
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PostgreSQL Foreign key - javatpoint
