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Define Atom of domain relational calculus
An atom has the outline < x1, x2, ... , xn > -> r , in which r stands for a relation on n attributes and x1, x2, ... , xn are the domain variables or domain constraints.
x Θ y , in which x and y are domain variables and Θ is the comparison operator (<, >, <, >, =, ≠). It is needed that x and y have domains which can be compared by Θ.
x Θ c, in which x is a domain variable, Θ is a comparison operator, and c is a constraint in the domain of attributes for which x is a domain variable.
Use Delegation to Share Implementation The delegation " Delegation comprises of catching an operation on one object and sending it to other object which is part, or related to
What is object identity? An object retains its identity even if some or all the values of variables or explanations of methods change overtime.
What is a database graph? The partial ordering implies that the set D may now be viewed as a directed acyclic graph, known as a database graph.
sir we want er diagram of bank management system in this main menu option as new account,deposit amount,withdraw amount,all acount holder list,modify account,close account
Define value set? Value set: It is a set of values. You do not always need a user to enter junk free text within all the fields. Therefore, Oracle Apps uses value set to valida
Part 1: Security Plan Consider the Case study and identify 3 security requirements. For each of these security requirements: • Discuss the necessity for the feature and how
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Write A short note on temporary tables? Temporary Tables - Temporary tables exists solely for a particular session, or whose data persists for the duration of the transaction
I need solution of the question posted at http://www.expertsmind.com/questions/sql-query-for-testing-triggers-and-stored-procedures-30140149.aspx
why three level architecture had been developed/
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