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WHAT IS CARDINALITY?

Answer Posted / zg

Cardinality is applicable on both entity and attribute levels.

Attribute Level : GENDER[MALE,FEMALE] - cardinality 2

Entity Level: CUSTOMER[HOME ADDRESS, MAILING ADDRESS,
SHIPPING ADDRESS, BILLING ADDRESS] cardinality (1,4)
Customer has 1 to 4 addresses

CUSTOMERS[ORDERS] cardinality (0,N)
Customer may have zero or more orders

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