For Higher Computing Science, revise the use of primary and foreign keys and the difference between flat file and relational databases.

Learn how to add and remove Primary Keys from an Access database table. The primary key's purpose is to promptly associate data from multiple tables and combine that data.

All documents in a MongoDB collection have a primary key dubbed _id . This field is automatically assigned to a document upon insert, so there’s rarely a need to provide it. What’s interesting ...

Primary keys come from candidate keys. Each candidate key consists of the attribute or attributes used to label a distinct row in a table. Every candidate key should contain the fewest number of ...

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.