Entity Set is a collection of entities of the same entity type. In the above example of STUDENT entity type, a collection of entities from the Student entity type would form an entity set.We can say that entity type is a superset of the entity set as all the entities are included in t...
Entity set is a collection of all entities of a particular entity type in the database. 该题直接提供了关于"Entity set"的明确定义,问题本身是完整的。根据数据库基础概念,实体集(Entity Set)是指属于同一类型的实体集合,即具有相同属性的实体的全体。题目中的描述与此定义一致,因此答案正确且无需补充内容。
Weak Entity set An entity set may not have sufficient attributes to form a primary key, and its primary key compromises of its partial key and primary key of its parent entity. 1. **问题完整性判断**:题目明确给出弱实体集的定义,并要求通过答案与解析解释其含义,命题完整。2. **关键定义分析*...
IBM uses the term entity in several products to describe a user, group, or resource. Entity might be further defined or set by the product. InFortran, almost every program element is referred to as an entity, such as a procedure, an operator, an interface block, an input-output unit, a...
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Definition:An entity is an organization established through laws oraccounting principlesthat separates it from its owners, other organizations, and individuals. All business forms are considered entities with the exception of a sole proprietorship. The various forms of partnerships and corporations are leg...
Any ProcessModel graphic can be used as an entity (activity, resource, storage, link, label). To use a non entity graphic as an entity, double-click on the graphic and change the object type to Entity. Each pre-defined entity graphic is assigned a number by ProcessModel. These numbers ...
Each entity object instance represents a row During runtime, each entity object instance represents a row in the database table and stores its data. There is only one instance per row, and all instances of the same entity object class within the same transaction are cached together. Multiple ...
Entity Attributes Also known as a column, an attribute is aproperty or characteristic of the entity that holds it. An attribute has a name that describes the property and a type that describes the kind of attribute it is, such as varchar for a string, and int for integer. When an ERD ...
When you first create an entity object usingreverse generation, a persistent entity attribute is created for each table column. After, if you change the table, you need to manually change the attribute. Forforward generation, when you create database tables from entity objects, each persistent at...