what is variable in package specification

3 Answers  

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Can we call procedure in select statement?

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How can you fetch common records from two tables?

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What is substitution variable in pl sql?

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select top 3 sal from each dept?

17 Answers   IBM, TCS,

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What is dcl in sql?

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how do you know the version of your mysql server? : Sql dba

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What does data normalization mean?

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How to call a javascript function from pl sql?

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What are the benefits of stored procedures?

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What is the current version of sql?

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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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