What is trigger and types?

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Can you sum a count in sql?

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how to calculate expressions with sql statements? : Sql dba

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What is pl sql commands?

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When sql appeared?

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Which tcp/ip port does sql server run?

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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 is sql? : Sql dba

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Can we insert in view in sql?

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What are all different types of collation sensitivity?

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Does oracle roll back the transaction on an error?

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what is recursive stored procedure? : Sql dba

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