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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:
SELECT INTO Statement The SELECT INTO statement retrieve data from one or more database tables, and then assigns the selected values to the variables or fields. Syntax:
Projection in SQL - correct version Student StudentId is enrolled on some course. SELECT DISTINCT StudentId FROM IS_ENROLLED_ON In more complicated examples it is someti
Package STANDARD package named STANDARD defines the PL/SQL atmosphere. The package specification globally declares the exceptions, types, and subprograms that are available a
Updating a Variable Assignment of an attribute value in a variable of a structured type Synatx: SET SN.C = 'S2'; As in Example the entire statement is equivalent to a
Example of ADD CONSTRAINT in SQL Example: Alternative formulation for MAX_ENROLMENTS ALTER TABLE IS_ENROLLED_ON ADD CONSTRAINT MAX_ENROLMENTS CHECK ((SELECT COUNT (*)
SSRS Report Writing Project Description: This report is part of a larger project to make a SQL Server Reporting Service (SSRS) based reporting solution. There can be more rep
Using Operator VALUE: As you may expect, the operator VALUE returns the value of an object. The VALUE takes its argument a correlation variable. For illustration, to return a
Managing Cursors The PL/SQL uses 2 types of cursors: implicit and explicit. The PL/SQL declares a cursor implicitly for all the SQL data manipulation statements, including th
Boolean Values Only the values TRUE, FALSE, & NULL can be assigned to a Boolean variable. For illustration, given the declaration DECLARE done BOOLEAN; the following statements
Wrapping and unwrapping in SQL Operators WRAP and UNWRAP in connection with attributes whose declared types are tuple types. Example shows how extension and projection can be
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