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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.
- FOREIGN KEY Constraints
MySQL supports foreign keys, which permit cross-referencing...
- 3.6.6 Using Foreign Keys
3.6.6 Using Foreign Keys. In MySQL, InnoDB tables support...
- FOREIGN KEY Constraints
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.
This tutorial shows you how to use the Oracle foreign key constraint to enforce the relationship between tables i.e., to maintain referential integrity.
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.
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.
3.6.6 Using Foreign Keys. In MySQL, InnoDB tables support checking of foreign key constraints. See Chapter 15, The InnoDB Storage Engine, and Section 1.7.2.3, “FOREIGN KEY Constraint Differences”. A foreign key constraint is not required merely to join two tables.
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.
