What are joins in sql?

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What is restrict in sql?

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Find out the 3rd highest salary?

51 Answers   BirlaSoft, DAC, Silvia Infotech, Sutra Infotech,

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Hi, Can anybody please explain me the flow of the below query. I am not able to understand how this query works. This query is for finding the Nth highest salary.. SELECT DISTINCT (a.sal) FROM EMP A WHERE &N = (SELECT COUNT (DISTINCT (b.sal)) FROM EMP B WHERE a.sal<=b.sal); If N = 2 then second highest salary will be the o/p. If N = 3 then third highest salary will be the o/p. and so on.. Thanks, Nitin

5 Answers   Deloitte, Ness Technologies,

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What are expressions?

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If the application is running very slow? At what points you need to go about the database in order to improve the performance?

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What are triggers and its types?

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Does sql full backup truncate logs?

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what is the difference between clustered and non clustered index in sql? : Sql dba

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Explain the rollback statement?

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What is pl/sql tables?

7 Answers   TCS,

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How does sql*loader handles newline characters in a record? : aql loader

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