Distinction between disjoint and overlapping constraints

In a disjoint constraint you would have to put the musician in either one or the other sub classes. In an overlapping constraint the musician can be put in both. ... This is a disjoint constraint situation because a bank account can either be Savings or Current. It cant be both at the same time.

1. What is the difference between disjoint and overlapping?
2. What is the difference between disjoint rule and overlap rule?
3. What are overlapping constraints?
4. What is overlapping constraint in DBMS?
5. Is disjoint AND or OR?
6. What is disjoint and overlapping rule in DBMS?
7. What is disjoint DBMS?
8. What is the overlap rule?
9. What do you understand by disjoint and overlapping subtypes?
10. What is disjoint in ER diagram?
11. What is an overlapping subtype?
12. What is ternary relationship in DBMS?
13. What is the difference between a specialization hierarchy and a specialization lattice?

What is the difference between disjoint and overlapping?

Disjoint events are events that don't have any outcomes in common. Overlapping events are events that have outcomes in common.

What is the difference between disjoint rule and overlap rule?

The disjoint rule forces subclasses to have disjoint sets of entities. The overlap rule forces a subclass (also known as a supertype instance) to have overlapping sets of entities.

What are overlapping constraints?

Overlap constraint - within an ISA hierarchy, an overlap constraint determines whether or not two subclasses can contain the same entity. ... An example is a single Employee entity set with a relation Reports-To that relates supervisors and subordinates.

What is overlapping constraint in DBMS?

Overlapping – In this category of generalizations, within a single generalization, the same entity may belong to more than one lower-level entity set. For example, in the employee work-team assume that certain employees participate in more than one work team.

Is disjoint AND or OR?

Disjoint events cannot happen at the same time. ... Disjoint events are disjointed, or not connected. Another way of looking at disjoint events are that they have no outcomes in common.

What is disjoint and overlapping rule in DBMS?

The disjoint rule states an entity instance of a supertype can only be a member of one subtype. The overlap rule states an entity instance of a supertype can be a member of multiple subtypes.

What is disjoint DBMS?

Disjoint means a subclass type patient can be either an outpatient or resident patient but not both. Subclasses can only be one subclass from the superclass not both.

What is the overlap rule?

For writable tables, in each record type on which a table is defined, none of the elementary data items may overlap except in the case of explicit redefinition within the same 01 record description.

What do you understand by disjoint and overlapping subtypes?

In a disjoint specialization, also called an exclusive specialization, an individual of the parent class may be a member of only one specialized subclass. In an overlapping specialization, an individual of of the parent class may be a member of more than one of the specialized subclasses.

What is disjoint in ER diagram?

Specifies that all subclasses of a specialization must be disjoint. In other words, if an entity belongs to one subclass of a specialization, then it cannot belong to another subclass of specialization, then it cannot belong to another subclass of the same specialization.

What is an overlapping subtype?

What is an overlapping subtype? Give an example. Overlapping subtypes are subtypes that contain non-unique subsets of the supertype entity set; that is, each entity instance of the supertype may appear in more than one subtype. For example, in a university environment, a person may be an employee or a student or both.

What is ternary relationship in DBMS?

In Ternary relationship three different Entities takes part in a Relationship. Relationship Degree = 3. For Example: Consider a Mobile manufacture company. Three different entities involved: Mobile - Manufactured by company.

What is the difference between a specialization hierarchy and a specialization lattice?

Specialization Hierarchy – has the constraint that every subclass participates as a subclass in only one class/subclass relationship, i.e.. . that each subclass has only one parent. ... Specialization Lattice – has the constraint that a subclass can be a subclass of more than one class/subclass relationship.