Often, primary keys are less obvious and it is necessary to create a unique value – often an ID number. A primary key is a guaranteed way of uniquely identifying each record.

The unique, primary key, and foreign key integrity constraints store data values in an index file. If an index file already exists, it is used; otherwise, one is created. Consider the following points ...

When working on a multidimensional design, every fact table within scope should be handled with care. In an ideal world, each low-level fact table represents the metrics related to a business event.

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 ...

Therefore, to support this misrepresentation of foreign keys the data modeler may have to exclude the Start Date from the primary key, misleading users as to how a unique row is identified. Or ...