Frequent cleaning with an air duster can would do the job
d. on. the. line. just. after the. command
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:
1G
Explanation:
1 'G' as in first generation.
Hope this helped. :)
