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What kinds of FDs are not allowed in 2NF What kinds of FDs are not allowed in 3NF What is the combined definition of 2NF and 3NF What kinds of FDs are not allowed in BCNF What is the relationship between BCNF and 3NF Is BCNF a stricter normal form than 3NF Briefly explain your answer 19 Why is the BCNF definition preferred to the 3NF definition
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20 What are the special cases covered by BCNF but not covered by 3NF 21 Are the special cases covered by BCNF but not 3NF significant 22 23 24 25 26 What is the goal of the simple synthesis procedure What is a limitation of the simple synthesis procedure What is a transitive dependency Are transitive dependencies permitted in 3NF tables Explain why or why not Why eliminate transitive dependencies in the FDs used as input to the simple synthesis procedure 27 When is it necessary to perform the fifth step of the simple synthesis procedure 28 How is relationship independence similar to statistical independence 29 What kind of redundancy is caused by relationship independence 30 How many columns does an MVD involve 31 What is a multivalued dependency (MVD) 32 What is the relationship between MVDs and FDs 33 What is a nontrivial MVD 34 What is the goal of 4NF 35 What are the advantages of using normalization as a refinement tool rather than as an initial de sign tool 36 Why is 5NF not considered a practical normal form 37 Why is DKNF not considered a practical normal form 38 When is denormalization useful Provide an example to depict when it may be beneficial for a table to violate 3NF 39 What are the two ways to use normalization in the database development process 40 Why does this book recommend using normalization as a refinement tool, not as an initial design tool
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Besides the problems presented here, the case study in 13 provides additional practice To supplement the examples in this chapter, 13 provides a complete database design case including conceptual data modeling, schema conversion, and normalization 1 For the big university database table, list FDs with the column StdCity as the determinant that are not true due to the sample data With each FD that does not hold, identify the sample rows that contradict it Remember that it takes two rows to contradict an FD The sample data are repeated in Table 7P1 for your reference
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Sample Data for the Big University Database Table
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StdCity SEATTLE SEATTLE BOTHELL BOTHELL
StdClass JUN
JUN JUN JUN
OfferNo
S1 S1 S2 S2
01 02 03 02
OffTerm FALL
FALL
OffYear
2006 2006 2007 2006
EnrGrade
35 33 31 34
CourseNo
C1 C2 C3 C2
CrsDesc DB VB
SPRING
FALL
00 VB
7
Normalization of Relational Tables 241
2 Following on problem 1, list FDs with the column StdCity as the determinant that the sample data do not violate For each FD, add one or more sample rows and then identity the sample data that contradict the FD Remember that it takes two rows to contradict an FD 3 For the big patient table, list FDs with the column PatZip as the determinant that are not true due to the sample data Exclude the FD PatZip > PatCity because it is a valid FD With each FD that does not hold, identify the sample rows that contradict it Remember that it takes two rows to contradict an FD The sample data are repeated in Table 7P2 for your reference 4 Following on problem 3, list FDs with the column PatZip as the determinant that sample data does not violate Exclude the FD PatZip > PatCity because it is a valid FD For each FD, add one or more sample rows and then identify the sample rows that contradict the FD Remember that it takes two rows to contradict an FD 5 Apply the simple synthesis procedure to the FDs of the big patient table The FDs are repeated in Table 7P3 for your reference Show the result of each step in the procedure Include the primary keys, foreign keys, and other candidate keys in the final list of tables 6 The FD diagram in Figure 7PI depicts FDs among columns in an order entry database Figure 7P 1 shows FDs with determinants CustNo, OrderNo, ItemNo, the combination of OrderNo and
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