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Datamodels, explain thee diffrent types of data models

explain thee diffrent types of data models

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Write a query to define tables students and teachers as sub tables of people? Create table students of student under people Create table teachers of teacher under people

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Define an abstraction by which relationships are treated as higher level entities Ans: Aggregation.  It is an abstraction by which relationships are treated as higher level

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Explain the benefit of OOM. Main benefits of object oriented modeling are development of system become fast, quality of the system get improve. It gives freedom of use of alrea

Why as clause is used in sql, Why 'AS' clause is used in SQL ? 'As' cla...

Why 'AS' clause is used in SQL ? 'As' clause is used for Rename operation. ‘AS' clause is used in SQL for rename operation. (e.g., SELECT ENO AS EMPLOYEE_NO FROM EMP)

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What is entity in DBMS? Entity: A DBMS entity is either a thing in the modelled world or a drawing element in an ERD.

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What is the error handling Traditionally, bits have been sent over line lacking any error correcting scheme in physical layer. The presence of the CPU in each modem makes it po

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Explain the systems development life cycle. This is the traditional method to develop, maintain, and replace information systems that contains the project identification and se

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