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An agency called Instant Cover supplies part-time/temporary staff to hotels throughout Scotland. The table shown in Figure 8.12 lists the time spent by agency staff working at two hotels. The National Insurance Number (NIN) is unique for every member of staff.
(a) The table shown in Figure 8.12 is susceptible to update anomalies. Provide examples of insertion, deletion, and modification anomalies.
(b) Identify the functional dependencies represented by the data shown in the table of Figure 8.12. State any assumptions you make about the data shown in this table.
(c) Describe and illustrate the process of normalizing the table shown in Figure 8.12 to 3NF. Identify the primary key and, where appropriate, alternate and foreign keys in each table.
(d) Demonstrate that the functional dependencies identified in part (b) are present in the 3NF tables described in part (c)
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