What do you understand by pl/sql cursors?

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What are the different types of joins and explain them briefly.

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How to fetch alternate records from a table?

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What is a ddl command?

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How can you create an empty table from an existing table?

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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 is record data type?

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What is self-join and what is the requirement of self-join?

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Is it possible to update views?

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A table was given with 3 columns like Manager id,Manager Name and Employee name. Question was to create hierarchy.

2 Answers   TCS,

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Is postgresql a server?

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what is text? : Sql dba

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