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Defining data requirements: Examiner (ExaminerNumber, Forename, Surname, Address, Postcode, SubjectReferenceCode) Centre (CentreNumber, NumberOfCandidatesEntered, ExaminerNumber, SubjectReferenceCode) Subject (SubjectReferenceCode, SubjectName, Payment) Examiner Table: Field Name Data Type ExaminerNumber Number Forename Text Surname Text Address Text Postcode Text TaxDeductionFlag Yes/No SubjectReferenceCode Number Centre Table: Field Name Data Type CentreNumber Number NumberOfCandidatesEntered Number ExaminerNumber Number SubjectReferenceCode Number Subject Table: Field Name Data Type SubjectReferenceCode Number SubjectName Text Payment Currency Data Entry Form For A Centre: Data Entry Form For An Examiner: Implementation Of Tables In A Database: Centre Table: As you can see, the fields CentreNumber and SubjectReferenceCode have been made joint primary keys. This is so that a centre can enter candidates for more than one subject. For example, if CentreNumber was the primary key on its own, then we could only enter candidates from the centre for one subject because if the CentreNumber was repeated, it would not be unique and therefore fall foul of the uniqueness check. Therefore, with both fields, CentreNumber and SubjectReferenceCode being made joint primary keys, we can enter candidates for more than one subject from a particular centre, because the CentreNumber and SubjectReferenceCode combination will be unique, so it will pass the...

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