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  1. www.w3schools.com › SQL › sql_ref_foreign_keySQL FOREIGN KEY - W3Schools

    FOREIGN KEY. The FOREIGN KEY constraint is a key used to link two tables together. A FOREIGN KEY is a field (or collection of fields) in one table that refers to the PRIMARY KEY in another table.

  2. database.guide › what-is-a-foreign-keyWhat is a Foreign Key? - Database.Guide

    May 24, 2016 · A foreign key is a field that links to another table's primary key in a relational database. Learn how foreign keys work, why they are important, and see an example of a one-to-many relationship.

  3. en.wikipedia.org › wiki › Foreign_keyForeign key - Wikipedia

    A foreign key is a set of attributes in a table that refers to the primary key of another table, linking these two tables.

  4. www.w3schools.com › sql › sql_foreignkeySQL FOREIGN KEY Constraint - W3Schools

    A FOREIGN KEY is a field that refers to the PRIMARY KEY in another table. Learn how to create, alter and drop a FOREIGN KEY constraint in SQL with examples and syntax.

  5. www.geeksforgeeks.org › foreign-key-in-dbmsForeign Key in DBMS - GeeksforGeeks

    Nov 12, 2023 · Learn what a foreign key is and how to use it in DBMS with MYSQL. A foreign key is a column that refers to the primary key/unique key of another table and establishes relationships between tables.

  6. learnsql.com › blog › foreign-key-sqlWhat Is a Foreign Key in SQL? | LearnSQL.com

    Nov 27, 2020 · A foreign key is a column that links two tables in a database and enforces data consistency. Learn how to create, use, and manage foreign keys in SQL with examples and clauses.

  7. www.programiz.com › sql › foreign-keySQL FOREIGN KEY Constraint (With Examples) - Programiz

    Learn how to create and use foreign keys in SQL to establish relationships between tables. See examples, syntax, insertion, and alteration of foreign keys.