what are sequences


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More SQL PLSQL Interview Questions

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

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What are local and global Indexes and where they are useful.

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If a View on a single base table is manipulated will the changes be reflected on the base table?

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What is sql basics?

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What is a dirty read sql?

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Is it possible to remove child records without removing master table records...the two having pk,fk relationship?

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How many levels can subqueries be nested in a FROM clause?

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How to remove duplicate rows from a table?.

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how can i read write files from pl/sql

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Is sql a dbms?

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How to revise and re-run the last sql command?

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Can we insert in view in sql?

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