A composite primary key<span> is a set of several primary </span>keys<span> that, together, uniquely identifies each record.</span>
Primary keys are used as identifiers of composite entities. In this case each primary key combination is allowed only once in the *:* relationship.
Other case where primary keys are used is as identifiers of weak entities, where the weak entity has a strong identifying relationship with the parent entity.
Answer:
The purpose of the domain name is for credibility and location purposes.
Explanation:
For example.
nz.gov means that the domain owner is the government on New Zealend
You must place a child in a federally approved child restraint device if the child is three years and under.
Answer:
Pulling related code together in objects is Arrays
Helps programmers when they revisit code or are new to code-- Documentation
Explanation:
This is all I know
