What is data profiling in sql?

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What is sql rowcount?

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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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What are schema-level triggers?

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If the application is running very slow? At what points you need to go about the database in order to improve the performance?

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What are the different types of database management systems?

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What is Raise_application_error ?

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What is trigger and how to use it in sql?

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How is sql used in oracle?

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what is the difference between truncate and drop statements? : Sql dba

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What are the uses of sysdate and user keywords?

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how can I make a script that can be bi-language (supports english, german)? : Sql dba

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