Total completeness means that every supertype occurrence must be a member of at least one subtype.
<h3>What is total completeness?</h3>
When a relationship is mistakenly or inadequately acknowledged, a depiction that is out of step with reality results. The most prevalent is the fan trap.
The completeness requirement states that any instance of an entity's subtype must also belong to at least one subtype. Complete and partial completion limitations are also viable options.
A circle above a single line indicates partial completeness, which means that some instances of a supertype may not belong to any subtype because not all instances of the supertype belong to that subtype.
One horizontal line is displayed beneath the circle to represent an incompleteness restriction.
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