Question

A primary index refers to
(1) primary key to relation
(2) foreign key of relation
(3) search key on which relation is sorted
(4) degree of B+ tree

Answer 1

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Answer 2

A primary index refers to:

1. primary key to relation

• A primary key or index refers to the primary or most important source that reveals data about the said specimen.
• These are generally more in detail and give more information than secondary or tertiary keys.
• Primary sources can be of several types: oral sources, written accounts, diagrams etc.
• These are the most important tools to identify and classify any new object or specimen.