bài tập trắc nghiệm cơ sở dữ liệu chương 15 methodology – logical database design for relational model (er – relation mapping) tutorial

Chapter 15 Methodology – Logical database design for relational model (ER – Relation Mapping) Tutorial 1. Represent the entity and relationship types shown in the ER diagrams below as relations. Employee empNo {PK} name address Project projectNo {PK} pName description WorksOn 1 * 1 * Employee empNo {PK} name address Holds 1 1 1 1 Employment Contract contractNo {PK} position date salary Vehicle regNo {PK} make model Check date {PPK} faults Has 1 1 0 * hours Supervises Employee empNo {PK} name address sDate 0 * 0 1 2. The ER diagrams shown below are taken from the example answers for Question 2 and 5 of the Chapter 11 Entity-Relationship Modeling Tutorial. However, for the purposes of this tutorial, the attributes associated with entity or relationship types are also included in the diagrams. Present a relational schema for each of the ER diagrams shown below. (a) Dependent dName {PPK} dAddress relationship RelatedTo 0 * 1 1 Company cName {PK} cAddress cTelNo cFaxNo Operates 1 1 1 * Department dNo {PK} dName dLoc Employs 1 1 Employee empNo {PK} name fName lName address Has 0 * 1 1 Employment History compOrganName (PPK} address position sDate fDate 1 * (b) OrderDetails qty status /totalPrice Requires 1 * 1 1 Product prodNo {PK} desc price cost numberAllocation reorderQty reorderLevel inStock PartOf 1 * Customer custNo {PK} name fName lName address street city postcode telNo creditLimit Places 1 * 1 1 Order ordeNo (PK} status dateDue /totalPrice 1 1 3. Present a relational schema for the ER diagram shown below. Dependent dName {PPK} relationship sex birthDate Project number {PK} name {AK} location RelatedTo 0 * 1 1 Employee SSN {PK} name fName mI lName address sex salary bDate WorksFor 1 * 1 1 Department name {PK} number locations [1…5] /noOfEmployees startDate Manages 1 1 0 1 Supervises 0 1 0 * WorksOn 0 * 1 * Controls 0 * 1 1 hours . Chapter 15 Methodology – Logical database design for relational model (ER – Relation Mapping) Tutorial 1. Represent the entity and relationship types shown in the ER diagrams below as relations. Employee empNo. Entity-Relationship Modeling Tutorial. However, for the purposes of this tutorial, the attributes associated with entity or relationship types are also included in the diagrams. Present a relational. 1 Order ordeNo (PK} status dateDue /totalPrice 1 1 3. Present a relational schema for the ER diagram shown below. Dependent dName {PPK} relationship sex birthDate Project number {PK} name {AK} location RelatedTo 0