A foreign key is a column or a set of columns in a database table that refers to the primary key of another table. Foreign keys establish relationships between tables in a relational database. They ensure referential integrity and maintain data consistency. Foreign keys can be used to enforce data integrity constraints. They allow for joining tables based on the related data. Example: In a database of students and courses, the student_id column in the courses table can be a foreign key referencing the primary key student_id in the students table.

AI Perception Interview Questions: what is foreign key?

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what is foreign key?

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A foreign key is a column or a set of columns in a database table that refers to the primary key of another table.

Foreign keys establish relationships between tables in a relational database.
They ensu...read more

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