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What does the cardinality ratio specify?
Mapping cardinalities or cardinality ratios state the number of entities to which another entity can be associated. Mapping cardinalities must be one of the following:
One to one
One to many
Many to one
Many to many
what are the type of the database
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does tables are called relations
What is an index? An index is a structure that helps to place desired records of a relation quickly, without probing all records.
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