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ISYS1055 Database Concepts For Decomposition And Functional Dependency

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  • Course Code: ISYS1055
  • University: RMIT University
  • Country: Australia


Answer questions:
Give likely FDs.
Give the candidate keys for the ABC relation. In your working, show how you develop the closure for each candidate key you have discovered..
Is the relation ABC in BCNF or 3NF? Explain your answer.


Answer to Question 1:

The candidate key for the doctor table is Rego. The candidate key for Patient Table is ID. The appointment table has candidate key, ID.

The tables are already in third normal form. All the attributes in the database are atomic. Each of the tables has primary key. There is no non-functional dependency or transitive dependency.

Answer to Question 2:

Functional Dependency:

The given custID has been presented as dependent on the orderID. In real life database application, the custID does not depend on the OrderID. The given relation is partially true not entirely. Based on the custID, the system will identify the orders. In terms of data insertion this relation may seem valid. However, in terms of data retrieval, the custID-> orderID is more effective.

Transaction is not in 3NF:

The transaction is not in 3NF as the itemNo is a multivalued attribute. The table is not even in the first normal form.  


Transaction(TransactionID, custID, orderID, discount, amount_due)

OrderedItem(itemNo, orderID, quantity)

The primary key is visualized through the underlined texts and foreign key through italics. 


Answer to Question 3:

deptname, Count(acnum) AS ‘Total number of academics’ From DEPARTMENT Inner Join ACADEMIC On DEPARTMENT.deptnum= ACADEMIC.deptnum Where deptname Like ‘Computer%’ OR deptname Like ‘Computing %’ AND deptname Like ‘%Science’ ORDER BY deptname ASC.

Select F.fieldnum, id, title From FIELD F Where Exists (Select ACNUM FROM INTEREST I WHERE fieldnum=F.fieldnum);

SELECT P.panum, P.title, Count(ACNUM) From paper P Inner Join author A ON P.panum = A.panum Group By P.panum HAVING Count(ACNUM)>2;  

SELECT CONCAT(A.FAMNAME, ', ', A.GIVENAME) As 'Academic Name', Count(AU.PANUM) From ACADEMIC A Left Join author AU ON A.ACNUM = AU.ACNUM Group By A.FAMNAME;  


Select I.fieldnum, id, title From FIELD F Inner Join INTEREST I ON F.fieldnum=I.fieldnum Group By F.FIELDNUM Having COUNT(I.fieldnum)<20;

SELECT P.panum, P.title FROM paper P Where Exists (Select A.ACNUM From Author A, ACADEMIC AC  Where PANUM=P.Panum AND A.ACNUM=AC.ACNUM AND deptnum = 100 AND P.Title Like '%Data%');

Select MAX(Interested) From (Select FIELDNUM, Count(FIELDNUM) AS Interested From Interest Group By FIELDNUM) AS I;

select acnum from interest I where upper(I.descrip) like '%D%';

The subquery returns all queries the Interest with two values.

The whole query returns name of the academic present in the interest table. 



Lubcke, A., Saake, G. and Neumann, T., 2017. Automated query interface for hybrid relational architectures (Doctoral dissertation, Otto-von-Guericke-Universität Magdeburg, Fakultät für Informatik).

Parreiras, F.S., Pinto, V.A., Soares, M.A.C. and Falci, D.H.M., 2017. Semantic middleware for industrial sensors. Ciência da Informação, 46(1).

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