Where not exists in sql?

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Which is faster subquery or join?

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What are the key differences between SQL and PL SQL?

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What is pl sql variable?

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How many triggers can be applied on a table?

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How many parts of a pl sql block are optional?

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What is the use of nvl function?

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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 mutating table and a constraining table?

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What does plvtab enables you to do when you showthe contents of pl/sql tables?

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

1 Answers   Fintellix,

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What is the difference between syntax error and runtime error?

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