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Learn how to use the FOREIGN KEY constraint to prevent actions that would destroy links between tables in MySQL. See examples of creating, naming, and dropping FOREIGN KEY constraints on CREATE TABLE and ALTER TABLE statements.
Learn how to create, drop and disable a foreign key constraint in MySQL. A foreign key is a column that links data in two tables and establishes a relationship between them.
Learn how to create and use foreign key constraints in MySQL to enforce data integrity across tables. See syntax, conditions, restrictions, referential actions, examples, and errors for foreign keys.
This tutorial introduces you to MySQL foreign key constraints and shows you how to manage foreign keys effectively.
Learn how to use the FOREIGN KEY constraint to link two tables together in SQL. See examples of creating, naming, and dropping FOREIGN KEY constraints in MySQL and other databases.
MySQL supports foreign keys, which permit cross-referencing related data across tables, and foreign key constraints, which help keep the related data consistent. A foreign key relationship involves a parent table that holds the initial column values, and a child table with column values that reference the parent column values.
Learn how to use foreign keys to cross-reference related data across tables and enforce referential integrity in MySQL. See the syntax, options, and examples of creating and altering foreign key constraints.
