what is 'mysqlimport'? : 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.

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what are the different index configurations a table can have? : Sql dba

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What is sorting in sql?

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What is an alias command?

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What are the ddl commands?

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How to maintain the history of code changes of pl/sql?

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Explain the structure of pl/sql in brief.

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What are different categories of sql commands?

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Is primary key a clustered index?

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what are the demerits of sql?

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Give the order of sql select?

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