How to place comments in pl/sql?

0 Answers  

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Which table is left in left join?

0 Answers  

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how are mysql timestamps seen to a user? : Sql dba

0 Answers  

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In a table only one column how to update rows

5 Answers   Microsoft,

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How can we solve sql error: ora-00904: invalid identifier?

0 Answers  

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Define union, minus, union all, intersect ?

0 Answers  

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What are literals in sql server?

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Can we delete column in sql?

0 Answers  

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what is acid property in database? : Sql dba

0 Answers  

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Can we use threading in pl/sql?

0 Answers  

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If a procedure within a package is invalidated whether the entire package will be invalid and has to be recompiled again?

2 Answers   IBM, TCS,

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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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