From the technical documentation at Microsoft : The FOREIGN KEY constraints cannot be used to create a self-referencing or circular FOREIGN KEY constraint.
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From the technical documentation at Microsoft : The FOREIGN KEY constraints cannot be used to create a self-referencing or circular FOREIGN KEY constraint.
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A recommended way to deal with the concern involves adding a warehouse surrogate key, which is used as a foreign key from the fact table.
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You can fake it with a lookup table and foreign key .-- & trade; 19 : 18, 3 August 2010 ( UTC)
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All data in a well designed database is directly or indirectly related to a limited set of master database tables by a network of foreign key constraints.
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In this case, the EmployeeID is both a foreign key and the unique primary key, meaning that the tables have a 1 : 1 relationship.
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A " dependent " entity has a surrogate but it belongs to another entity, i . e . the surrogate is a foreign key.
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A table can also have a "'foreign key "'which indicates that field is linked to the primary key of another table.
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The following example uses Entity Framework and configures the TodoList class to be stored in the database table Lists and defines a primary and a foreign key.
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Common methods of ensuring logical integrity include things such as a check constraints, foreign key constraints, program assertions, and other run-time sanity checks.
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