If normalized tables are a relational database’s foundation, then relationships are the cornerstone. ... Each primary key value relates to only one (or no) record in the related table.

Real-world relational databases have tables that contain fields, constraints, ... That’s what most database design tools generate. Primary keys are always indexed and unique ...

One of the principles within relational theory is that each entity's row or tuple be uniquely identifiable. This means the defined structure includes some combination of attributes whose populated ...

The original intention of surrogate keys across multidimensional database designs was to help optimize joins by keeping all keys, used for joining between facts and dimensions, both numeric and single ...

Relational SQL databases, which have been around since the 1980s, historically ran on mainframes or single servers—that’s all we had.If you wanted the database to handle more data and run ...

NoSQL databases range from key-value stores to columnar databases to document databases to graph databases. On the face of it, nothing sounds more natural or reasonable than a NoSQL database. The ...