What is a procedure in pl sql?

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What is forward declaration in pl sql?

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how to create user in sql and how to set password for that?

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How many commands are there in sql?

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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 is nested table in pl sql?

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Explain normalization and what are the advantages of it?

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Show how functions and procedures are called in a pl/sql block.

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I want to create synonym for table emp but in my pc it is giving insufficient previliges.I am using user scott.Please suggest me.

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What are stuff and replace function?

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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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Explain clause in sql?

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