Total participation, indicated by a double line in an ER diagram, means that every entity in the entity set participates in at least one relationship within the set. True or False?
Understand the Problem
The question is asking whether the definition of total participation in an Entity-Relationship (ER) diagram is accurate. Total participation, often visually represented by a double line connecting an entity set to a relationship, implies a mandatory participation constraint. This means every entity in that entity set must participate in at least one relationship instance in that relationship set.
Answer
True
True. Total participation, represented by a double line in an ER diagram, means every entity participates in at least one relationship within the set.
Answer for screen readers
True. Total participation, represented by a double line in an ER diagram, means every entity participates in at least one relationship within the set.
More Information
Total participation is also known as mandatory participation.
Tips
A common mistake is confusing total participation with partial participation, where entities are not required to participate in a relationship.
Sources
- [PDF] Entity Chapter 7: Entity-Relationship Model - users.dimi.uniud.it
- [PDF] Chapter 2: Entity-Relationship Model - TINMAN - tinman.cs.gsu.edu
- What is total participation and partial participation in DBMS? - Quora - quora.com
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