Explain the working of primary key?

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Can you have more than one trigger on a table?

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Why is sql*loader direct path so fast?

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7. Where would you look for errors from the database design?

1 Answers   Fintellix,

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What is rownum in 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 is a recursive join sql?

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How would you convert date into julian date format?

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Is sql developer case sensitive?

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Write a query to find the name of employees those who have joined on Monday.(based on column hire_date)

15 Answers   Satyam,

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What is posting?

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Why do we use subquery?

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