2.1

Which programming language is specialized for requesting data from relational databases ?

QUEL

Java

JavaScript

PHP

How are data organized in relational databases ?

network-like

in a flat way

in three dimensions

in a hierarchical way

What is the most important principle in relational databases design ?

Data must never be duplicated

Data must never be deleted

Data must always have a backup

Data must be continuously updated

Which concept allows rows in a table to be identifiable in a unique way ?

Attribute

Foreign key

Record

Primary key

Who invented the concept of the relational data model ?

Tokioshi

Parker

Makovsky

Codd

How many records an entity can have at most ?

65536

As far as there is space enough on the hard disk

Infinitely many

Records and entities have nothing to do with each other