Some database designers try to avoid such semantic issues by defining OrderID as non-nullable so that it must have a value, even when not part of the primary key. These designers then try to propose ...

A primary key is a field used to uniquely identify every record in the database. Sometime primary ... of staff in the teacher table is Staff ID. A foreign key is a primary key from one table ...

“Foreign key support has been a longstanding feature request from day-one nine years ago,” says Ulin. “It brings more advanced relational database management capabilities into Cluster.” In addition, a ...

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 ...