<<labele>> declare a=10 b=20, begin some statements declare a=30 c=40 end; what is the A value in nested block?

1 Answers   ITC Infotech,

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how will you find out the last three records in a table with n no of records and delete them

3 Answers  

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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 the command used to fetch the first 5 characters of a string?

0 Answers  

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write a procedure to find top second no from a list of numbers

1 Answers   ABC,

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Can there be more than one function with a similar name in a pl/sql block?

0 Answers  

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What is difference between TRUNCATE & DELETE?

16 Answers   Ahn Infotech, CitiGroup, ICICI, PreVator, Saama Tech, SkyTech, TCS,

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Why do we use procedures?

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How many sql databases can you have on one server?

0 Answers  

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Table name: T1, it has only one column. col1 ------ c b a b b b b d s a a t s Requirement: I need the following output from the above base table by using SQL query. col1 Cnt ----- ------- a 3 b 5 Others 5 Please help. Thanks Guru v.gurus@in.com

11 Answers  

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Explain exception handling in pl/sql?

0 Answers  

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What is the syntax and use of the coalesce function?

0 Answers  

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