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What is Cardinality Ratio?
Cardinality Ratios - The cardinality ratios for relationship kinds specifies the maximum number of relationship instances in which an entity can participate in. The possible cardinality ratios for relationship categories are one-to-one (1:1), one-to-many or many-to-one (1:M or M:1), and many-to-many (M:N).
Describe Database state in details? Database state: The actual data within the database at a particular moment in time is known as a database state.
What is NULL? Simply NULL means not in value.
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