Can a table in SQL have multiple columns as foreign keys that refer only to one primary key of another table? - Quora
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mysql - How to add an auto incremented primary key as a foreign key to existing database tables? - Stack Overflow
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How to add Foreign key Constraint to existing table in SQL Server-SQL Server/TSQL Tutorial Part 68 - YouTube
![How to add Foreign key Constraint to existing table in SQL Server-SQL Server/TSQL Tutorial Part 68 - YouTube How to add Foreign key Constraint to existing table in SQL Server-SQL Server/TSQL Tutorial Part 68 - YouTube](https://i.ytimg.com/vi/AJ0RTqICzAY/maxresdefault.jpg)