Database Management Systems
DATABASE MANAGEMENT SYSTEMS (ORACLE) ASSIGNMENT ON NORMALISATION
QUESTION 1
Table 1 below lists sample dentist/patient appointment data. A patient is given an appointment at a specific time and date with a dentist located at a particular surgery. On each day of patient appointments, a dentist is allocated to a specific surgery for that day.
- Identify the functional dependencies represented by the attributes shown in the Table 1. State any assumptions you make about the data and the attributes shown in this table.
- Describe and illustrate the process of normalizing Table 1 to 3NF relations. Identify the primary, alternate, and foreign keys in your 3NF relations.
Table 1: Table displayingsampledentist/patientappointment data.
QUESTION 2
An agency called Instant Cover supplies part-time/temporary staff to hotels within Scotland. Table 2 below displays sample data, which lists the time spent by agency staff working at various hotels. The National Insurance Number (NIN) is unique for every member of staff.
- Table 2 is susceptible to update anomalies. Provide examples of insertion, deletion, and update anomalies.
- Identify the functional dependencies represented by the attributes shown in the table. State any assumptions you make about the data and the attributes shown in this table.
- Describe and illustrate the process of normalizing the table to 3NF. Identify primary, alternate and foreign keys in your relations.
Figure 2: Table displaying sample data for the Instant Coveragency.
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