What is varchar sql?

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What is trigger and types?

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Is there a pl/sql pragma similar to deterministic, but for the scope of one single sql select?

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What is pragma in pl sql?

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What is the difference between anonymous block and named block or stored procedure?

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What is normalization? How many normalization forms are there?

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can i create trigger on synonym is it possible or not please help me

4 Answers   CGI,

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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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How many subqueries can be nested in a statement?

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What is procedure and function in sql?

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define primary key & secondary key?

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What program will open a mdb file?

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