What are the three basic rules which are to be followed for the relational model of the database?

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Given an employee table, how would you find out the second highest salary?

9 Answers  

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Explain about normal forms?

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Who are naive users?

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On friday, you issued several insert statements using query analyzer. You then verified the data had been correctly entered with a select statement on monday, your users report that the data is not there what happened?

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How to replace not in with not exist?

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agregator gives one to many records or many to one record

1 Answers   IBM,

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You are testing the performance of a query the first time you run the query, the performance is slow. the second time you run the query, the performance is fast. why is this?

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What is normalization? Explain different levels of normalization?

8 Answers   CG-VAK, Choice Solutions, College School Exams Tests, IBM, Wipro,

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What are data modelling techniques?

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There is a trigger defined for INSERT operations on a table, in an OLTP system. The trigger is written to instantiate a COM object and pass the newly insterted rows to it for some custom processing. What do you think of this implementation? Can this be implemented better?

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When installing the datastage7.5x2 edtion iam getting aproblem i.e the cpu count is 2 but the cpu count in installation is one . how can i install in my p.c (system is dual core).

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