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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 is linked to another table ‘s primary key field in a relationship between two tables. In relational database management systems, a relationship defines a relationship between two or more tables. That is, the data in one table is related to the data in the other.

  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

    The FOREIGN KEY constraint is used to prevent actions that would destroy links between tables. A FOREIGN KEY is a field (or collection of fields) in one table, that refers to the PRIMARY KEY in another table.

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

    Nov 12, 2023 · Foreign keys are a set of constraints in DBMS that establish relationships between tables and also ensure consistency and integrity of data. A foreign key is applied to a column of one table which references the primary key of a column in another table.

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

    Nov 27, 2020 · What does a foreign key do in SQL? Why would you need one? Learn the ABCs of foreign keys in five minutes. Foreign keys are a central concept in SQL databases; they allow us to enforce data consistency. Usually they work with primary keys to connect two database tables, like a virtual bridge.

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

    In SQL, the FOREIGN KEY constraint is used to create a relationship between two tables. A foreign key is defined using the FOREIGN KEY and REFERENCES keywords. Example