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Describe Database state in details?
Database state: The actual data within the database at a particular moment in time is known as a database state.
What is a SELECT operation? The select operation selects tuples that please a given predicate. We use the lowercase letter σ to denote selection.
Define null values. In some cases a certain entity may not have an applicable value for an attribute or if we do not know the value of an attribute for a certain entity. In the
Differentiate between various levels of data abstraction? Data Abstraction - Abstraction is the procedure to hide the irrelevant things from the users and represent the rele
Give an example of operations from the State Actions and Activities. For instance, in bank the activity verify account code and verify password
Question: (a) What are decision support systems, and what role do they play in the business environment? (b) Data mining is a knowledge discovery process of automated extr
What is Gathering information and Producing ERD Gathering information: This could be a written document that explains the system in question with reasonable quantity of detai
Software failures : In such cases, a software error abruptly stops the implementation of the current transaction (or all transactions), therefore leading to losing the state of pr
What is a value? A data value is used for identity. This form of identity is used in relational systems.eg: The primary key value of a tuple recognize the tuple.
What is the aim of object design The aim of object design is to identify object which the system contains and the interactions among them. The system implements specification
What are the reasons for having variable length records? What are the various ways to store variable length records? Variable-length records arise in a database in various wa
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