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Cardinality of Relationship
One-to-One
Only one entity of the first set is linked to only one entity of the second set. E.g. A teacher teaches a student. Only one teacher is teaching only one learner.
One-to-Many
Only one entity of the first set is related to many entities of the second set. E.g. A teacher teaches learners.
Many-to-One
Multiple entities of the first set are related to many entities of the second set. E.g. Teachers teach a learner.
Many-to-Many
Multiple entities of the first set are related to multiple entities of the second set. E.g. Teachers teach learners
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What are the drawbacks of File Oriented System in details?
A database administrator''s responsibilities and data contents
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Authorisation Authorisation is the culmination of the administrative policies of the organisation. As the name shows, authorisation is a set of rules that can be used to verif
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