Скачать или смотреть Understanding SQL's Foreign Key Constraint | SQL session 21| Hindi

In SQL, a foreign key is a field or a set of fields that refers to the primary key of another table. The purpose of a foreign key is to establish a relationship between two tables, which allows data from one table to be related to data in another table.

A foreign key constraint is a rule that ensures that the data in the foreign key column(s) of one table corresponds to the data in the primary key column(s) of another table. This constraint helps maintain referential integrity, which means that the relationships between tables are maintained even if data is modified or deleted.
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