# Has-a | | In database design, object-oriented programming and design, **has-a** is a composition relationship where one object "belongs to" another object, and behaves according to the rules of ownership. In simple words, has-a relationship in an object is called a member field of an object. Multiple has-a relationships will combine to form a possessive hierarchy. | |-|-| | | wikipedia:: [Has-a](https://en.wikipedia.org/wiki/Has-a) |