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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.
distributed quey processing
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List the drawbacks of relational database system A) Repetition of data B) Inability to s certain information.
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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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