| 11. | Also, foreign keys are not supported.
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| 12. | PostgreSQL is triggers, foreign keys; supports functions and stored procedures, and other expandability.
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| 13. | In Relational database terms, the ReportsTo column is a foreign key referencing the EmpNo column.
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| 14. | File cross-connects or joins are handled as a synonym definition of the foreign key.
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| 15. | Each foreign key constraint is dependent upon a unique database index from the parent database table.
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| 16. | When a PK migrates to another table, it becomes a foreign key in the other table.
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| 17. | In particular, natural join allows the combination of relations that are associated by a foreign key.
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| 18. | Database tables in a cache group must each have a defined primary key-foreign key constraints.
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| 19. | It is also used to decide in which order to load tables with foreign keys in databases.
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| 20. | For Sqlite2 and MySQL 5.1 . x it provides automatic relation discovery through foreign keys.
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