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foreign key ИНФОРМ

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A fact table typically has two types of columns: those that contain facts and those that are a foreign key to dimension tables. en.wikipedia.org

For instance, deleting a record that contains a value referred to by a foreign key in another table would break referential integrity. en.wikipedia.org

Here is an example of a primary key becoming a foreign key on a related table. en.wikipedia.org

In particular, natural join allows the combination of relations that are associated by a foreign key. en.wikipedia.org

Persistent columns can be indexed and can be part of a foreign key, with a few small limitations concerning constraint enforcement. en.wikipedia.org

In other words, when a foreign key value is used it must reference a valid, existing primary key in the parent table. en.wikipedia.org

Finally, overlapping value sets possibly representing foreign key relationships between entities can be explored in an inter-table analysis. en.wikipedia.org

File cross-connects or joins are handled as a synonym definition of the foreign key. en.wikipedia.org

Most primary key indexes, foreign key indexes and software codes for categorized textual values can be replaced with their natural language equivalents. en.wikipedia.org

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