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Cardinality shows the number of instances of an entity associated with another entity participating in a relationship. Depend on the cardinality binary relationship can be further dividing into the following categories:
Example: Relationship between university/college and principal
One college only have at the most one principal and one principal can be assigned to only one college.
Likewise we can define the relationship among Vice Chancellor and university.
Relationship between Security and Integrity: Database security usually refers to access, while database integrity refers to avoidance of accidental loss of consistency. But usually
a brief definition
Which are the two ways in which entities can participate in a relationship? Total and partial are the two ways in which entities can participate in a relationship
In E-R Diagram how relationship type is represented ? In E-R Diagram relationship type is represented as a Diamond.
Inheritance Adjustment As in object oriented analysis and design terms inheritance defines a relationship between classes, where as one class shares structure or behaviour def
Determine the advantage of object-orientation Finally, object-orientation has advantage of continuity throughout analysis, persistent representation and design implementation.
#floating point representation is used to store
What is Outer join? They can be employed while we want to keep all the tuples in R, or all those in S or all those in both relations in the result of the JOIN in spite of of w
Entity types that do not have any key attribute, and therefore cannot be identified independently, are known as weak entity types. A weak entity can be recognized uniquely only by
What is key ? Key - A single attribute or a combination of two or more attributes of an entity set which is used to recognize one or more instances (rows) of the set (table) is
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