Changes

In the realm of Relational databases, an entity (ie an online shopper) is and must be uniquely identified by its 'primary key'. When 2 or more attributes are required to uniquely identify an entity, this collection of attributes is called a ''composite primary key''.  

In the realm of Relational databases, an entity (ie an online shopper) is and must be uniquely identified by its 'primary key'. When 2 or more attributes are required to uniquely identify an entity, this collection of attributes is called a ''composite primary key''.  

==== Virtualization ====

==== Virtualization ====

To financially survive regional lockdown policies, many businesses made services accessible over the internet as much as possible.  Examples are mobile-apps with fast food establishments. Slogans like 'skip the line' or 'order online, pickup in person', or 'curbside delivery' all of which use some sort of phone-accessible ordering system.

To financially survive regional lockdown policies, many businesses made services accessible over the internet as much as possible.  <br />

Training institutions delivered streamed lecture content and web-based assessments.  Fast food and retail establishments promoted mobile-apps and online services with slogans like 'skip the line' or 'order online, pickup in person', or 'curbside delivery' all of which use some sort of phone-accessible ordering system.

==== Biometrics ====

==== Biometrics ====