Vanilla MySQL doesn't support any sort of referential integrity. You can use "InnoDB" tables (here) that add that functionality. If you're in a shared hosting ...

Ensuring the integrity of the organization’s databases is a key component of the DBA’s job. A database is of little use if the data it contains is inaccurate or if it cannot be accessed due to ...

Cascading referential integrity constraints are foreign key constraints that tell SQL Server to perform certain actions when a primary key field in a primary key-foreign key relationship is updated or ...