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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.
The issues relating to the Design of the Physical Database Files Physical File is a file as stored on the disk. The major issues relating to physical files are: • Cons
Given the subsequent relations: vehicle (reg_no, make, colour) Person (eno, name, address) Owner (eno, reg_no) Write expressions
What are object interaction diagrams? Object interaction diagrams are the diagrams that used to describe order in which messages are communicated in execution of an operation,
Define upgrade and downgrade? It gives a mechanism for conversion from shared lock to exclusive lock is called as upgrade. It gives a mechanism for conversion from exclusive
You are required to design and build a data mart/data warehouse using Oracle. A national bank allocates funding every year for its local branches to provide temporary staff cove
Describe logical data independence ? Logical Data Independence - It is the capacity to modify the conceptual schema without having to change external schemas or application p
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What is called an evaluation primitive? A relational algebra operation annotated with instructions on how to evaluate is known as an evaluation primitive.
Define various ways in which SELECT statement can be used for record selection Technology? SELECT gives you control over a number of aspects for record retrieval: 1) Which
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