An entity and its M:N unary relationship are mapped as one relation.

Name: An entity and its M:N unary relationship are mapped as one relation.
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In database design, an M:N unary relationship (many-to-many relationship with itself) requires at least two tables to be properly represented: one for the entity and another for the relationship, to store pairs of entity identifiers that are related.

An Entity and Its M:N Unary Relationship Are Mapped as One