what is msql? : Sql dba

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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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How to delete same emp id in sql query for exmaple in emp table emp id, empname, emp address. for example emp id =5, repeated in two times in rows same id how to delete same empid please any one of the write query send in my id

8 Answers   CGCI,

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What are the types of triggers in sql?

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What is a call statement? Explain with an example.

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Explain the methods used to protect source code of pl/sql.

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GLOBAL TEMPORARY TABLE over Views in advantages insolving mutating error?

0 Answers   Virtusa,

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How to perform a loop through all tables in pl/sql?

4 Answers   Evosys, MBT,

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Can we edit a view in sql?

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What is the use of sql trace?

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what is global variable in package

3 Answers   Polaris,

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what happens when the column is set to auto increment and you reach the maximum value for that table? : Sql dba

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