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the bottom FDs, the combination of LineNo and OrderNo determines ItemNo and the combination of OrderNo and ItemNo determines LineNo To test your understanding of dependency diagrams, convert the dependency diagram into a list of dependencies organized by the LHSs
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TABLE 7P2
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VisitNo V10020 V10020 V93030 V82110
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Sample Data for the Big Patient Table
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PatNo P1 P1 P3 P2 PatAge 35 35 17 60 PatCity DENVER DENVER ENGLEWOOD BOULDER PatZip 80217 80217 80113 85932 ProvNo D1 D2 D2 D3 ProvSpecialty INTERNIST NURSE PRACTITIONER NURSE PRACTITIONER CARDIOLOGIST Diagnosis EAR INFECTION INFLUENZA PREGNANCY MURMUR
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TABLE 7P3 List of FDs for the Big Patient Table
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PatNo PatAge, PatCity, PatZip > PatZip - PatCity ProvNo ProvSpecialty > VisitNo - PatNo, VisitDate, PatAge, PatCity, PatZip VisitNo, ProvNo Diagnosis >
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FIGURE 7P1 Dependency Diagram for the Big Order Entry Table
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CustNo CustBal
OrderDate ShipAddr
PlantNo ReorderPoint
OrderNo I
- QtyOnHand ItemNoJ ItemDesc
QtyOrdered ItemNo
QtyOutstanding LineNo
-CustDiscount
LineNo
OrderNo
QtyOrdered
QtyOutstanding
Part Four
Relational Database Design
7 Using the FD diagram (Figure 7PI) and the FD list (solution to problem 6) as guidelines, make a table with sample data There are two candidate keys for the underlying table: the combination
of OrderNo, ItemNo, and PlantNo and the combination of OrderNo, LineNo, and PlantNo Using
8 9 10 11
the sample data, identify insertion, update, and deletion anomalies in the table Derive 2NF tables starting with the FD list from problem 6 and the table from problem 7 Derive 3NF tables starting with the FD list from problem 6 and the 2NF tables from problem 8 Following on problems 6 and 7, apply the simple synthesis procedure to produce BCNF tables Modify your table design in problem 10 if the shipping address (ShipAddr) column determines customer number (CustNo) Do you think that this additional FD is reasonable Briefly explain your answer 12 Go back to the original FD diagram in which ShipAddr does not determine CustNo How does your table design change if you want to keep track of a master list of shipping addresses for each customer Assume that you do not want to lose a shipping address when an order is deleted 13 Using the following FD list for a simplified expense report database, identify insertion, update, and deletion anomalies if all columns are in one table (big expense report table) There are two candidate keys for the big expense report table: ExpItemNo (expense item number) and the com bination of CatNo (category number) and ERNo (expense report number) ExpItemNo is the pri mary key of the table ERNo -> UserNo, ERSubmitDate, ERStatusDate ExpItemNo ExpItemDesc, ExpItemDate, ExpItemAmt, CatNo, ERNo > UserNo UserFirstName, UserLastName, UserPhone, UserEmail > CatNo -> CatName, CatLimit ERNo, CatNo -> ExpItemNo UserEmail UserNo CatName -> CatNo
14 Using the FD list in problem 13, identify the FDs that violate 2NF Using knowledge of the FDs that violate 2NF, design a collection of tables that satisfies 2NF but not 3NF 15 Using the FD list in problem 13, identify the FDs that violate 3NF Using knowledge of the FDs that violate 2NF, design a collection of tables that satisfies 3NF 16 Apply the simple synthesis procedure to produce BCNF tables using the FD list given in prob lem 13 Show the results of each step in your analysis 17 Convert the ERD in Figure 7P2 into tables and perform further normalization as needed After converting to tables, specify FDs for each table Since the primary key of each table determines the other columns, you should only identify FDs in which the LHS is not the primary key If a table is not in BCNF, explain why and split it into two or more tables that are in BCNF 18 Convert the ERD in Figure 7P3 into tables and perform further normalization as needed After the conversion, specify FDs for each table Since the primary key of each table determines the other columns, you should only identify FDs in which the LHS is not the primary key If a table is not in BCNF, explain why and split it into two or more tables that are in BCNF Note that in the Owner and Buyer entity types, the primary key (SSN) is included although it is inherited from the Person entity type 19 Convert the ERD in Figure 7P4 into tables and perform further normalization as needed After the conversion, write down FDs for each table Since the primary key of each table determines the other columns, you should only identify FDs in which the LHS is not the primary key If a table is not in BCNF, explain why and split it into two or more tables that are in BCNF In the User entity type, UserEmail is unique In the ExpenseCategory entity type, CatDesc is unique In the StatusType entity type, StatusDesc is unique For the Expenseltem entity type, the combi nation of the Categorizes and Contains relationships are unique 20 Convert the ERD in Figure 7P5 into tables and perform further normalization as needed After the conversion, write down FDs for each table Since the primary key of each table determines the other columns, you should only identify FDs in which the LHS is not the primary key If a
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