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Define NULL value
NULL value NULL means something is unknown. It does NOT mean null (the digit 0). Null is as well employed as attribute value for a particular entity in which attribute is not applicable for example name of child for unmarried.
Relationship between Security and Integrity: Database security usually refers to access, while database integrity refers to avoidance of accidental loss of consistency. But usually
Define an operator that a Relational Algebra does not have Ans: Relational Algebra does not have Aggregation operators.
Give the Introduction of OBJECT DESIGN Strategies which are selected during system design are carried out in object-oriented design. In this procedure, objects which are identi
#question. acompani datdbase needs to store information about employees (identified by a social security number,with salary and phone as attributes) and departments (identified by
What is a virtual table that draws its data from the result of an SQL SELECT statement? View is a virtual table that draws its data from the result of an SQL SELECT statement.
Draw an entity relationship diagram (ERD) for the following situation: A company has a number of employees. Each employee is identified by an Employee_Id. The company wants to st
In E-R Diagram how relationship type is represented ? In E-R Diagram relationship type is represented as a Diamond.
explain the steps for reduction of er model into relational model?
explain various steps uses in evaluation and maintenance of MIS.
To delete a particular column in a relation which command is used ? To delete a particular column in a relation ALTER command is used.
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