VISIO 2019 SUPERTYPE SUBTY[E FREE TO ADD

Position the Connector tool over the center of the parent table so that the table is outlined, and drag it to the center of the child table. On the Home tab, in the Tools group, click Connector. Open your database model diagram.

Visio 2019 Supertype Subty[E Free To Add

Every employee has a unique employee number assigned. The company has approximately 500 employees. Draw the E-R diagram in Visio and name it as problem1-team-x.vsdx.You must use the non-associative entities listed below, and are free to add only associative entities. On the database side, how would I ensure that Supertype ID's of a given type were only put into the appropriate subtype table For example, I would not want a Supertype ID with Type A to be put into the SubtypeB table.2 Problem 1 5 points Develop an E-R diagram for a consulting company to keep track of its employees, projects, and vendors. 166Modern Database Management, Ninth EditionSuperType. Both connection points appear red, and any primary keys in the parent table are added as.

Give other examples where either the total specialization rule or the partial specialization rule is more appropriate.7.Discuss the disjointness constraint and related notation using Figure 4-7. Have your students suggest other examples that use each of these techniques.6.Introduce the completeness constraint using Figure 4-6. Use this figure to introduce the example of attribute inheritance.4.Use Figure 4-3 to discuss the two major reasons for introducing supertype/subtype relationships: unique attributes among subtypes, and unique subtype relationships.5.Contrast generalization and specialization using Figures 4-4 and 4-5. Introduce your students to all three types of notation.3.Discuss the EMPLOYEE example with subtypes (Figure 4-2). Use this notation to represent the example you introduced in (1). From an instructors point of view, the objectives of this chapter are to:1.Introduce the concept of supertype/subtype relationships, and prepare the student to recognize when to use these relationships in data modeling.2.Describe the use of specialization (top-down perspective) and generalization (bottom-up perspective) as complementary techniques for defining supertype/subtype relationships.3.Introduce notation for specifying both completeness constraints and disjointness constraints when modeling supertype/subtype relationships.4.Help students gain sufficient perspective so that they recognize when to use (and when not to use) supertype/subtype relationships in realistic business situations.5.Describe the basic premises of a business rules paradigm.6.Describe a simple framework for categorizing business rules.7.Introduce notation for modeling typical operational constraints that can be incorporated in your EER diagram.Action assertionDisjoint ruleStructural assertionAnchor objectDisjointness constraintSubtypeAttribute inheritanceEnhanced entity-relationship (EER) modelSubtype discriminatorCorresponding objectEntity clusterSupertype/subtype hierarchyDerivationGeneralizationTotal specialization rulePartial Specialization ruleUniversal data modelClassroom Ideas1.Introduce the concept of supertypes and subtypes with a familiar example, such as VEHICLE (subtypes are CAR, TRUCK, SUV, etc.).2.Introduce the basic notation for supertype/subtype relationships (Figure 4-1).

Consider inviting an industry guest speaker to discuss how these universal data models are utilized in his/her company. Review universal data models and discuss how these are being used more widely today. For reinforcement, ask the students to work problem 2 (Problems and Exercises) in class.11. Review the extended example of a supertype/subtype hierarchy shown in Figure 4-10. Discuss entity clustering and illustrate with Figures 4-13 and 4-14.10. Discuss why a different notation is required for the two cases shown in these figures.9.

Discuss the notion of structural assertions, and illustrate with examples shown in Figure 4-19.14. Give examples for each type of rule.13. Discuss the classification of business rules shown in Figure 4-18.

A subgrouping of the entities in an entity type that is meaningful to the organization.C. A generic entity type that has a relationship with one or more subtypes.B. See if they can diagram these rules using the notation provided in this chapter.Answers to Review Questions 1.Define each of the following terms:A. Ask your students for examples of other business rules they have encountered recently in their work, school, or home experience. For this example, show how the business rule is captured with notation on the diagram.15.

Specifies that each entity instance of the supertype must be a member of some subtype in the relationship.I. Total specialization rule. An attribute of the supertype whose values determine the target supertype or subtypes.H. A business rule (a fact) on which actions are limited.G. A statement that expresses some aspect of the static structure of the organization.F. A set of one or more entity types and associated relationships grouped into a single abstract entity type.E.

Generalization specialization. A supertype is a generalized entity type that has one or more subtypes, while a subtype is a subgrouping of the entities in a supertype.B. Universal data model: A generic or template data model that can be reused as a starting point for a data modeling project.2.Match the following terms and definitions:A. A statement of a constraint or control on the actions of the organization.M. Specifies that an entity instance can simultaneously be a member of two (or more) subtypes.L. Specifies that if an entity instance (of the supertype) is a member of one subtype, it cannot simultaneously be a member of two (or more) subtypes.K.

Disjoint rule overlap rule. An anchor object is a business rule on which actions are limited, whereas a corresponding object influences the ability to perform an action on another business rule.D. Anchor object corresponding object.

Ability to have a hierarchical decomposition of data model.C. The reasons for entity clustering are:B. There are relationships that apply to some (but not all) of the instances of an entity type.5. There are attributes that apply to some (but not all) of the instances of an entity type.B. PARTY PARTY ROLE: In a universal data model, PARTY represents persons and organizations independent of the roles they play whereas PARTY ROLE contains information about a party for an associated role.4.Two conditions that indicate a designer should consider using supertype/subtype relationships:A.

Structural assertion: a person is a customer of a store.B. In an organizational context, PERSON may have subtypes of EMPLOYEE, CONTRACTOR, CUSTOMER, VENDOR, MANAGER, etc.A. Ability to create several different entity clusters each with a different focus.6.An example of a supertype/subtype relationship:The supertype PERSON has many possible subtypes: MALE, FEMALE, INFANT, TEENAGER, etc, assuming these different types of persons have somewhat different attributes or participate in different relationships.