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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
What is called as an N-way merge? The merge operation is a generalization of the two-way merge used by the standard in-memory sort-merge algorithm. It merges N runs, so it is k
write-set(T): Each data items that are written by a transaction T
DISADVANTAGES OF RDBMS
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draw er diagram using entities crop,employee,department,plot,cultivation plan,machinery,seed,fertilizer
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