How do I find duplicates 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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Which is better cte or subquery?

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Is left join and outer join same?

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How does sql profiler work?

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what is acid property in database? : Sql dba

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What are the conditions an underlying table must satisfy before a cursor can be used by a positioned update or delete statement? : Transact sql

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What is coalesce in sql?

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What is a unique key and primary key and foreign key?

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how to debugg a procedure or package using dbms_output.put_line in plsql

1 Answers   Polaris,

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How do sql triggers work?

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What is bulk collections?

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