Question

Define primary sort key and secondary sort key.

Answer 1

Explanation:

For example, the items are books, the sort key is the title, subject or author, and the order is alphabetical. A new sort key can be created from two or more sort keys by lexicographical order. The first is then called the primary sort key, the second the secondary sort key,

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Answer 2

Answer:

Sorting is any process of arranging items systematically, and has two common, yet distinct meanings

ordering: arranging items in a sequence ordered by some criterion;

categorizing: grouping items with similar properties.

Ordering items is the combination of categorizing them based on equivalent order, and ordering the categories themselves.