By using cascading referential integrity constraints, you can define the actions that SQL Server 2005 takes when a user tries to delete or update a key to which existing foreign keys point. Skip ...

SQL tutorial: Learn SQL on PostgreSQL. how-to. Oct 8, 2018 14 mins. Databases Relational Databases SQL. ... or by adding foreign key constraints to enforce referential integrity. ...

Real-world relational databases have tables that contain fields, constraints, and triggers, and tables are related through foreign keys. SQL is used to declare the data to be returned, and a SQL ...