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Update or Modify operation alters the existing values. If these operations alter the value that is the foreign key also, the only check need is the similar as that of the Insert operation.
What should happen to an try to update a candidate key that is the objective of a foreign key reference? For instance, an attempt to update the PROJID "LG" for which there exists at least one matching ASSIGNMENT tuple? In common there are the similar possibilities as for DELETE operation:
RESTRICT: The update operation is "restricted" to the case where there are not matching assignment tuples. (it is rejected otherwise).
CASCADE - The update operation "cascades" to update the foreign key in those matching assignment tuples also.
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Which file organization provides very fast access to any arbitrary record of a file? Hashed file organization provides very fast access to any arbitrary record of a file.
what do you mean by primary key constraint?
What is a recursive relationship? Give an example not used in the text. A recursive relationship is a relationship among an entity and itself. For example, given the entity PER
entity relationship diagram for online examination system
#explain five disadvantages of a dbms..
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