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What is a primary key?
Primary key is chosen by the database designer as the principal means of identifying an entity in the entity set.
Eliminate Repeating Groups The problem is, "Find out the list of employees, who knows DB2". For this problem we require to perform an awkward scan of the list looking for re
What is conceptual model ? A conceptual model is a independent of both hardware and software.
In a job interview with a branch manager of a bank that operates in multiple Canadian provinces and the Yukon, you learn that all of the information is captured in real time in a s
What is Candidate Key Super Key or Candidate Key: It is such an attribute of a table that can uniquely recognize a row in a table. Generally they have unique values and can n
Benefits of using heuristics
The natural join is equal to which product? The natural join is equal to Combination of projection and Cartesian product
Question 1 Discuss about second normal form and third normal form Question 2 Write short note on 1) Data Manipulation Language 2) Data Definition La
Explain the rules for creating a labelled precedence graph for testing view serializability. Ans: A schedule S is view serializable if it is view equivalent to a ser
What are the object-oriented approaches Software systems which are designed with structured design methodology never support some of desired quality attributes for example reus
Answer SQL Queries to extract data from data tables and questions on mapping conceptual data models into relational data model.
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