A primary key is a field used to uniquely identify every record in the database. Sometime primary keys are obvious, for example a car license plate could be used to uniquely identify cars.

For National 5 Computing Science, revise the use of primary and foreign keys and the difference between flat file and relational databases.

In Microsoft SQL Server, for example, a primary key usually equates to a clustered index. In SQLite, a primary key is usually just a unique index and is distinct from the special rowid column name.

Which makes for a better primary key: natural data points or meaningless values? Database developers have strong opinions on this facet of primary key design. This article settles the debate once ...

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.

Imagine each squad member as a primary key, representing a unique identifier within a database table. Similar to how each squad member has a unique player ID, a primary key in SQL ensures that each ...