Question

what is foreign key.​

Answer 1

Explanation:

A foreign key is a column or group of columns in a relational database table that provides a link between data in two tables. ... The concept of referential integrity is derived from foreign key theory. Foreign keys and their implementation are more complex than primary keys

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Answer 2

Answer:

A foreign key is a column in a relational database table that provides a link between data in two tables. It acts as a cross-reference between tables because it references the primary key of another table, thereby establishing a link between them. Therefore, When a primary key from

one table appears in another table, it is called a foreign key. It refers to the field in a table which is the primary key of another table. It can contain duplicate values

and a table in a relational database.

Explanation:

• Foreign keys help you to migrate entities using a primary key from the

• Foreign keys help you to migrate entities using a primary key from the A foreign key enables you to link two or more tables together.

• It makes your database data consistent

• A foreign key can be used to match a column or combination of columns with primary key in a parent tables.

• SQL foreign key constraint is used to make sure the referential integrity of the data parent to match values in the child table.

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