Why do we use function in pl sql?

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What is thread join () in threading?

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what is subquery? : Sql dba

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what are the differences between require and include, include_once and require_once? : Sql dba

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What is a file delimiter?

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Enlist some predefined exceptions?

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What does “select count(1) from tab” result?

10 Answers   IBM,

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What programs use 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.

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what are the advantages and disadvantages of cascading style sheets? : Sql dba

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What are different types of functions in sql?

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What is varchar data type in sql?

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