Ordinal Data - Comparison Operator (Order, Equality)

Data System Architecture

About

A comparison operator is a class of operators that model:

A comparison operator test the order relationship between two operands and returns a Boolean.

The result of a comparison is a Boolean

Usage

Sort

Comparison Operator are tiddly coupled:

in order to sort data.

Condition / Filter

Comparison Operator are used in predicate (condition) in order to filter

Properties

Order of precedence

order of precedence - All comparison operators have the same priority, which is lower than that of all operator mathematical operators

Chain

Comparisons may be chained.

For example, a < b == c tests whether:

  • a < b
  • and moreover b == c

Combination

Comparisons may be combined using the Boolean operators and and or to from a predicate (boolean expression)

Relation

Comparison operator models two kind of relation:

Binary relation are used in many branches of mathematics to model this relation. See Logical Data Modeling - Binary Relation.

Order

Order relation, including strict orders:

Operation Description
< strictly less than
<= less than or equal
> strictly greater than
>= greater than or equal
in check whether a value occurs in a list
not in check whether a value does not occur in a list

Equivalence

The equal operators model an equivalence relationship

Documentation / Reference




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