1. A rule or limitation in object-oriented programming and type systems that defines which subtypes can inherit from or be used in place of a parent type, ensuring type safety and behavioral consistency
The subtype constraint ensures that any derived class must implement all abstract methods from the base class.
A restrição de subtipo garante que qualquer classe derivada deve implementar todos os métodos abstratos da classe base.
2. In database systems and data modeling, a constraint that specifies the valid relationship between a parent entity type and its subtypes
The subtype constraint in the schema prevents invalid combinations of entity attributes.
A restrição de subtipo no esquema impede combinações inválidas de atributos de entidade.