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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:
Updating by insertion Syntax : INSERT INTO ENROLMENT VALUES (SID ('S4'), 'Devinder', CID ('C1'));
Parameter Modes: You do not require to specify a parameter mode for the input bind arguments (those used, for illustration, in the WHERE clause) as the mode defaults to IN. Th
Obtaining a natural join by specifying the common columns Synatax: SELECT * FROM IS_CALLED JOIN IS_ENROLLED_ON USING ( StudentId ) However, a named columns join doe
Declaring Objects: You can use the object types wherever built-in types like CHAR or NUMBER can be used. In the block below, you can declare object r of type Rational. Then, yo
PPD , CPA, Filesharing Site Project Description: This is very easy I need a PPD , CPA, Filesharing Site. [PPD] stands for (pay per download) example hotsharecash [Files
UPDATE Command- SQL Loosely speaking, UPDATE changes some of the column values of some existing rows of its target table. Thus, although some rows disappear from the target an
Declaring and Initializing Objects: An object type is once defined and installed in the schema; you can use it to declare the objects in any PL/SQL, subprogram, block or packa
Number Types The Number types permit you to store the numeric data (real numbers, integers, and floating-point numbers), show quantities, and do computations. BINARY_INTEG
ROWID and UROWID Internally, every database table has a ROWID pseudo column that stores binary values known as rowids. Each rowid shows the storage address of a row. A physical
Error Handling The PL/SQL makes it easy to detect and process the predefined and user-defined error conditions known as exceptions. Whenever an error occurs, an exception is ra
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