Exam (elaborations)
INF3707 EXAM PACK 2023.
- Institution
- University Of South Africa
INF3707 EXAM PACK 2023.
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Question 1 10 marks
1.1 Which Oracle Database management system is prescribed for this module? (2 marks)
1.2 How do you login as the system administrator on the Oracle SQL*plus interface? Provide the code.
(2 marks)
1.3 After you have successfully installed Oracle database, how do you open the pluggable databases so
that they can automatically open? (4 marks)
1.4 By default, Oracle pluggable databases remain closed and must be opened manually or set
to automatically open. Which Oracle 18c XE service must you configure to do that? (2 marks)
Question 2 40 marks
Assume that a table named MyTable exist in your database. MyTable has five columns Col#, Col1, Col2,
Col3 and Col4.
NAME NULL TYPE
-------- ------ ---------
Col# NOT NULL Number Primary key
Col1 NOT NULL VARCHAR2(2)
Col2 NOT NULL VARCHAR2(10)
Col3 NOT NULL VARCHAR2(10)
Col4 NOT NULL VARCHAR2(10)
2.1 Write an SQL statement that enables you to view the structure of MyTable. (2 marks)
2.2 Write an SQL statement that allows you to see the data contained in all the columns of MyTable.
(3 marks)
2.3 MyTable contains some columns that are marked as unused. Write an SQL code that drops all the
columns marked as unused. (4 marks)
2.4 All the data entered into MyTable is not correct. Write an SQL code that deletes the data from the
table but leaving it intact. (3 marks)
2.5 You realised that Col1 and Col4 are too small to accommodate large variables, write an SQL code
that increases the size of Col1 from 2 to 17 and Col4 from 10 to 25. (5 marks)
2.6 Insert data into three columns of MyTable, by populating Col1, Col2 and Col4 with values A, B and
D in that order. Do not insert any data into Col3, store a null value. (5 marks)
2.7 If the primary key of this table was created with the following statement:
Col# Number GENERATED AS IDENTITY PRIMARY KEY;
What output do you expect after inserting the following data into MyTable? Explain your answer.
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