INF3707 EXAM PACK 2022

INF3707 EXAM PACK 2022. INF3707 - Database Design And Implementation 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. Downloaded by: sihlengubane | Distribution of this document is illegal S - The study-notes marketplace 3 INF3720 OCT/NOV [Turn over] Insert into MyTable (Col#, Col1, Col2, Col3, Col4) value (001, ‘A’, ‘B’, ‘C’,’D’); (2 marks) 2.8 You created a sequence that generated some numbers for Col3 of MyTable. The sequence is as follows: Create sequence seq1 Increment by 10 Maxvalue 200 Cycle Nocache; After generating some numbers from the sequence a few times, you want to reinitialize the sequence so that it can reuse the numbers already generated.? Write an SQL code to achieve that. (5 marks) 2.9 Create a bitmap index on MyTable to speed up queries for searching information based on Col2. Verify that the index exists. Delete the index (11 marks) Question 3 19 marks JustLee Books has recently hired a temporary salesman. The name of the new employee is John. The login credential for John should expire at the end of his contract. As a salesperson, John should be granted some object privileges on the JustLee Books database. 3.1 Create the user John with a password that expire, with the role of Sales_person. (5 marks) 3.2 As a salesperson, John has full responsibility for the CUSTOMERS table of the JustLee Books. Grant John object privileges to perform any activity on the customers table and rights to grant the privileges to other users. (4 marks) 3.3 John approached you on a Monday morning and reported that he does not remember his password. Reset John’s password. (3 marks) 3.4 Write a query to view all privileges that are assigned to the Sales_person role. (4 marks) 3.5 The contract for John has expired, revoke the Sales_person privilege granted to John and remove his user account. (3 marks) Question 4 31 marks This question refers to the JustLee Books, see Annexure A for the structure of the tables 4.1 Determine which books customer Jake Lucas purchased. Perform the search using the customer name, not the customer number. If he has purchased multiple copies of the same book, duplicate the results. Generate the report using the (JOIN…..USING) keywords. (10 marks) 4.2 Determine, which orders had a higher total amount due more than order 1008. Use subqueries to answer the question. (10 marks) S - The study-notes marketplace Downloaded by: sihlengubane | Distribution of this document is illegal S - The study-notes marketplace 4 INF3720 OCT/NOV 4.3 Determine the average retail price of books by publisher name and category. Include only the categories Children and Computer, and the groups with an average retail price greater than $50. Use the BOOKS and CATEGORY tables to create the query. (6 marks) 4.4 What is the retail price of the most expensive book written by Lisa White? Use the BOOKS, BOOKAUTHOR and AUTHOR tables to create the query