A database is a collection of objects that includes tables, views, stored procedures, triggers, and indexes. Each database contains several database system files and data files. Databases are usually ...

To upgrade databases from a wagon to a jetpack, we need to remove ourselves entirely from the constraints imposed by the classical relational model and create a better way.

Excel possesses formidable database powers. Creating a relational database starts with a Master table that links to subordinates called (awkwardly) Slave, Child, or Detail tables.

Are you still putting your data in plain, old spreadsheets? Excel 2013 makes it easy to link tables, create reports and more.

However, it is often necessary to defer constraint enforcement - during a database migration for example or loading a relational schema with cyclic foreign key dependencies.