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1 What is an entity type
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What is an attribute What is a relationship What is the natural language correspondence for entity types and relationships What is the difference between an ERD and an instance diagram What symbols are the ERD counterparts of foreign keys in the Relational Model What cardinalities indicate functional, optional, and mandatory relationships
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Understanding Entity Relationship Diagrams 161
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8 When is it important to convert an M-N relationship into 1-M relationships 9 How can an instance diagram help to determine whether a self-referencing relationship is a 1-M or an M-N relationship 10 When should an ERD contain weak entities 11 What is the difference between an existence-dependent and a weak entity type 12 Why is classification important in business 13 What is inheritance in generalization hierarchies 14 What is the purpose of disjointness and completeness constraints for a generalization hierarchy 15 What symbols are used for cardinality in the Crow's Foot notation 16 What are the two components of identification dependency 17 How are M-way relationships represented in the Crow's Foot notation 18 What is an associative entity type 19 What is the equivalence between an M-N relationship and 1-M relationships 20 What does it mean to say that part of a primary key is borrowed 21 What is the purpose of the diagram rules 22 What are the limitations of the diagram rules 23 What consistency rules are commonly violated by novice data modelers 24 Why do novice data modelers violate the identification dependency rules (consistency rules 6 through 8) 25 Why do novice data modelers violate consistency rule 9 about redundant foreign keys 26 Why should a CASE tool support diagram rules 27 How does the ER Assistant support consistency rules 4 and 5 28 How does the ER Assistant support all rules except consistency rules 4 and 5 29 Why does the ER Assistant not require resolution of all diagram errors found in an ERD 30 How does the ER Assistant implement consistency rule 9 about redundant foreign keys 31 List some symbol differences in ERD notation that you may experience in your career 32 List some diagram rule differences in ERD notation that you may experience in your career 33 What is the Unified Modeling Language (UML) 34 What are the modeling elements in a UML class diagram 35 What kinds of business rules are formally represented in the Crow's Foot ERD notation 36 What kinds of business rules are defined through informal documentation in the absence of a rules language for an ERD ProI)l( niS The problems emphasize correct usage of the Crow's Foot notation and application of the diagram rules This emphasis is consistent with the pedagogy of the chapter The more challenging problems in 6 emphasize user requirements, diagram transformations, design documentation, and schema conversion To develop a good understanding of data modeling, you should complete the problems in both chapters 1 Draw an ERD containing the Order and Customer entity types connected by a 1-M relationship from Customer to Order Choose an appropriate relationship name using your common knowl edge of interactions between customers and orders Define minimum cardinalities so that an order is optional for a customer and a customer is mandatory for an order For the Customer en tity type, add attributes CustNo (primary key), CustFirstName, CustLastName, CustStreet,
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CustCity, CustState, CustZip, and CustBal (balance) For the Order entity type, add attributes for the OrdNo (primary key), OrdDate, OrdName, OrdStreet, OrdCity, OrdState, and OrdZip If you
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are using the ER Assistant or another drawing tool that supports data type specification, choose appropriate data types for the attributes based on your common knowledge 2 Extend the ERD from problem 1 with the Employee entity type and a 1-M relationship from Employee to Order Choose an appropriate relationship name using your common knowledge of
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interactions between employees and orders Define minimum cardinalities so that an employee is optional to an order and an order is optional to an employee For the Employee entity type,
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add attributes EmpNo (primary key), EmpFirstName, EmpLastName, EmpPhone, EmpEmail,
EmpCommRate (commission rate), and EmpDeptName If you are using the ER Assistant or an other drawing tool that supports data type specification, choose appropriate data types for the attributes based on your common knowledge 3 Extend the ERD from problem 2 with a self-referencing 1-M relationship involving the Employee entity type Choose an appropriate relationship name using your common knowledge of organizational relationships among employees Define minimum cardinalities so that the rela tionship is optional in both directions 4 Extend the ERD from problem 3 with the Product entity type and an M-N relationship between Product and Order Choose an appropriate relationship name using your common knowledge of connections between products and orders Define minimum cardinalities so that an order is optional to a product, and a product is mandatory to an order For the Product entity type, add
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