The column (field) in a relational database ... A "composite primary key" or "super key" is made up of two or more columns such as account number + name. See candidate key. THIS DEFINITION IS ...

Database developers have strong opinions on this facet of primary key design. This article settles the debate once and for all. By definition, a relational database must contain normalized tables ...

When building up a logical design, primary keys should be identified by the actual data points in play. Generated or surrogate keys should be held in abeyance until dealing with the physical design ...

Primary keys, such as account number cannot be ... may be duplicated in the file or database. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction requires permission.