database relational model, Database Management System

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what do you mean by primary key constraint?

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State the data flow diagram of functional model Any action initiated by transition in the state diagram can be extended into an entire data flow diagram in functional model. Th

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For each 1: n relationship type R involving two entities E1 and E2, we recognize the entity type (say E1) at the n-side of the relationship type R and contain primary key of the en

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Attributes attached to an entity can be of various types. Simple The attribute that cannot be further separated into smaller parts and shows the basic meaning is known as a

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When is a transaction rolled back? Any changes that the aborted transaction made to the database must be uncompleted. While the changes caused by an aborted transaction have be

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explain the steps for reduction of er model into relational model?

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State The position of object at any moment is called state. An object can have many states depend upon time. After receiving some input instructions, the object can change its

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What is persistency? Persistency ensures which data is stored and that after the object is no longer available (program stops running) the data will be available to other users

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The users who use easy-to-use menu are called ? The users who use easy to use menu are called as Naïve users.

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3. (10 points) Assume that you have been presented with the following relation for the Baxter Aviation database: Charters (Pilot#, Pilot name, Aircraft ID#, #seats, Village, Fligh

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