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Question:
(a) In the context of database security explain how the following database features help to enforce security in the database system:
(i) Authorisation (ii) Access Control (iii) Views
(b) Database security involves measures to avoid loss of privacy and loss of confidentiality. Explain what is meant by the above terms.
(c) Write SQL code to create a view of name Toronto_finance_view that contains the employee last name, the department name and the city of all employees that works in the Finance department located in the city of Toronto.
(d) Write SQL code to give the select privilege to the view created above to Mark and Spencer.
A Deductive Database System can be conceived as a database capable of deducing additional new data from data that is explicitly represented (facts), by applying specified rules of inference to those facts (e) Discuss the main features of a deductive database system, and contrast it with a relational database system. Your discussion should include identifying the role of logic programming in a deductive database.
(f) In the context of deductive databases, explain the following concepts:
In Packages The Forward declarations also group logically related subprograms in the package. The subprogram specifications go in the package specification, & the subprogram b
Using a join on 2 tables, select all columns and 10 rows from the 2 tables without the use of a Cartesian product. Query: SELECT * FROM EMPLOYEE1 E JOIN STAFF S ON E.EMP_
Keyword and Parameter Description: table_reference: This specifies a table or view that should be accessible when you execute the DELETE statement, and for that you must
Rephrase Conditional Control Statements When computing a logical expression, the PL/SQL uses short-circuit evaluation. That is, the PL/SQL stops evaluating the expression as s
Challenge 1 You are required to do the project and write a test plan for it. Demo 4 is a check writer program for employees. In it, the user enters all information about the
Explicit Cursor Attributes The cursor variable or each cursor has four attributes: %FOUND, %ISOPEN, %ROWCOUNT, and %NOTFOUND. When appended to the cursor or cursor variable, th
Positional Notation The first procedure call uses the positional notation. The PL/SQL compiler relates the first actual parameter, account, with the first proper parameter, ac
Parameter Default Values As the illustration below shows, you can initialize the IN parameters to the default values. In that way, you can pass various numbers of actual par
Logical Connectives - SQL SQL's extended truth tables in which the symbol, for unknown, appears along with the usual T and F. Negation (NOT, ¬) Conjunction (
Identifiers You use identifiers to name the PL/SQL program items and units that include constants, variables, cursors, exceptions, cursor variables, subprograms, and packages.
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