How can you maintain the integrity of your database on instances where deleting an element in a table result in the deletion of the element(s) within another table?

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What is rank dense_rank and partition in sql?

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How does postgresql compare to "nosql"?

0 Answers  

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function can return multiple value?how give give sample coding

2 Answers   3i Infotech, CTS, Excelity Global, UHG,

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What are the different ways to optimize a sql query?

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What is constant in pl sql?

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what is difference b/w pravite procedures and public procedures?

3 Answers   Steria, Wipro, Zensar,

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What is mutating sql table?

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Where the sql database files are stored?

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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 is self join and why is it required? : Sql dba

1 Answers  

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Store procedure will return a value?

4 Answers   eMids,

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