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Explain Superkey
Ans: A superkey is described in the relational model of database organization like a set of attributes of a relation variable for which it holds that in all relations assigned to that variable there are no two different tuples (rows) that have similar values for the attributes in this set. Consistently a superkey can as well be defined as a set of attributes of a relvar upon that all attributes of the relvar are functionally dependent.
What is DML Query Langauge? Data Manipulation Language (DML) - A data manipulation language is a language in which enables users to access or manipulate data as organized throu
It is mandatory that for every table in the LDB hierarchy there should exist one GET statement in the report. False. It is not essential.
Project: Microsoft Access You have been asked by the ABC Tanning Salon to create a database that can be used to track the salon's customers. You are to create a table in Access
What is candidate key? Candidate Key - A candidate key of an entity set is a minimal superkey, which uniquely identifies each row in the relation.
Determine the OBJECTIVES of object design After passing through this unit, you should be able to: describe and apply concept of generalisation; understand and appl
The dataset " CFOLYMPICS.XLS " contains the observations used in the above article. The definitions of the variables are also included in this spreadsheet. However, for the purpo
WRITE SHORT NOTES ON INDEX STRUCTURE OF FILES? There are two basic parts of indices 1. Ordered indices 2. Hash indices Every technique must be evaluated on the bas
Database Administrator One of the main perpose for having the database management system is to have control of both data or programs accessing that data. The person having li
Example -Find the employee name, salary, department number and average salary of his/her department, for those employees whose salary is more than the average salary of that depart
Synonyms It allows short names or alternative names for objects. Example : CREATE SYNONYM D30 FOR EMPD30; Now if we give command:
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