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what is Nested relational model? Explain with examples.
What is the need for triggers? Triggers are useful mechanisms for alerting humans or for starting particular tasks automatically when particular conditions are met.
Explain the conventions (relationships) for displaying an ER schema as an ER diagram.
What is transaction? Collections of operations that form a single logical unit of work are known as transactions.
3 assignments combined in 1
Draw an ER diagram that shows the organization of a simple student database. The database captures the information about letter grades obtained by university students who enrolled
Define Two phase commit Two phase commit: To make sure atomicity, all the sites where a transaction is being executed must agree on the final outcome of the execution. The tran
List the types of authorization. A) Read authorization B) Write authorization C) Update authorization D) Drop authorization
Differance between internal and external schema? Internal and external schema: Internal Schema • Describes the physical storage structure • Uses a physical data model External
write a database program for concurrency transaction in a bank
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