Total completeness means that every supertype occurrence must be a member of at least one subtype.
It occurs when a relationship is incorrectly or insufficiently recognized, leading to a representation that is inconsistent with reality. The fan trap is the most typical.
Each instance of an entity's supertype must also belong to at least one subtype, according to the completeness requirement. Both partial and complete completion constraints are possible.
Partial completeness (shown by a circle over a single line) denotes that not all instances of a supertype belong to a particular subtype; hence, some instances of a supertype could not belong to any subtype.
An incompleteness restriction is shown as one horizontal line under the circle.
To learn more about total completeness:
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