Explain the rollback statement?

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What is view? Can we update view

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how to check the 3rd max salary from an employee table? One of the queries used is as follows: select sal from emp a where 3=(select count(distinct(sal)) from emp b where a.sal<=b.sal). Here in the sub query "select count(distinct(sal)) from emp b where a.sal<=b.sal" or "select count(distinct(sal)) from emp b where a.sal=b.sal" should reveal the same number of rows is in't it? Can any one here please explain me how is this query working perfectly. However, there is another query to get the 3rd highest of salaries of employees that logic I can understand. Pls find the query below. "select min(salary) from emp where salary in(select distinct top 3 salary from emp order by salary desc)" Please explain me how "select sal from emp a where 3=(select count(distinct(sal)) from emp b where a.sal<=b.sal)" works source:http://www.allinterview.com/showanswers/33264.html. Thanks in advance Regards, Karthik.

4 Answers  

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What are actual parameters and formal parameters?

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What is mutating table error?

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what is difference between procedure and function

10 Answers   MCN Solutions, Wipro,

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what is a database? : Sql dba

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Regarding joins what are the differences you observed in oracle 9i and sql server?

3 Answers   Choice Solutions,

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What is schema in sql?

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what is commit? : Sql dba

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Compare SQL and PL/SQL.

3 Answers  

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What sql database should I use?

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