"primary-key." YourDictionary, n.d. Web. 23 March 2019. <https://www.yourdictionary.com/primary-key>.
primary-key. (n.d.). Retrieved March 23rd, 2019, from https://www.yourdictionary.com/primary-key
primary key - Computer Definition
The field (column) in a database table that is indexed and maintains the main sequence of the table. For example, account numbers are typically primary keys. A "composite primary key" is made up of two or more fields (columns) such as region + account number.