What is Difference Between delete and Truncate?

9 Answers  

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What is offset in sql query?

0 Answers  

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write sub query for eliminating duplicate rows using analytical function?

3 Answers   Metric Stream,

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Is it possible to sort a column using a column alias?

0 Answers  

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What are the two types of exceptions.

0 Answers  

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When we give SELECT * FROM EMP; How does oracle respond?

24 Answers   Accenture, HCL, Infosys,

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Is id a reserved word in sql?

0 Answers  

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What is memory optimized table?

0 Answers  

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Is primary key a clustered index?

0 Answers  

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What is parameter substitution in sql?

0 Answers  

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Can we use rowid as primary key?

0 Answers  

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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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