What is a primary key sql?

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Can we use threading in pl/sql?

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what is the difference between implicit conversions and explicit conversions?

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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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What plvcmt and plvrb does in pl/sql?

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Does SQL*Plus contains pl/sql Engine?

1 Answers   TCS,

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What is bulk collect in pl sql?

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What are the parts of a basic sql query?

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Why use stored procedures?

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What are triggers and its uses?

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what is the difference between rownum pseudo column and row_number() function? : Sql dba

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what is the difernece between named and anonymous pl/sql blocks??

8 Answers   TCS, Wells Fargo,

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