Tansy SQL Course | Foreign Key | Chapter 5 | Lesson 12
Автор: Tansy Academy
Загружено: 2025-01-26
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A Foreign Key is a column or a set of columns in one table that establishes a link to the primary key in another table. It enforces referential integrity by ensuring that the value in the foreign key column matches a valid value in the referenced primary key column, or is `NULL`. This relationship allows for data consistency and logical associations between related tables.
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