In a relational database approach ... There are times when a foreign key becomes embedded within a table's primary key. In the previous example given above, the CustomerOrderTable has a column named ...

A primary key is a field used to uniquely identify every record in the database ... example, the primary key used to identify each member of staff in the teacher table is Staff ID. A foreign ...

A foreign key is a relationship between two entities. Generally speaking, inter-entity relationships are one-to-many, e.g., an ORDER has many ORDER LINEs, and so forth. Even a case that may start out ...

If a delete statement affects rows in a foreign key table, those values will be set to NULL when the primary key record is deleted. If an update statement affects rows in the foreign key table ...