This formal Id column will not end up as a primary key in the same way you might think of a primary key in mainstream SQL database engines. In Microsoft SQL Server, for example, a primary key usually ...

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 ...

MySQL table primary keys and unique indexes prevent multiple rows with the same index from being added to the table. If you try to insert a duplicate row with a standard INSERT statement, you will ...