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.
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TRUE. The internet began as a military infrastructure project for communication purposes.
Only those cells names. Most common mistake in excel. If you want to sort rows make sure you highlight everything and then use sort function on column
