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Question: What does the following query do?
SELECT SAL + NVL(COMM,0) FROM EMP;

Answer: This displays the total salary of all employees. The null values in the commission column will be replaced by 0 and added to salary.



Category SQL Interview Questions & Answers - Exam Mode / Learning Mode
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Added on 10/12/2009
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Question: What does the following query do?
SELECT SAL + NVL(COMM,0) FROM EMP;

Answer:

This displays the total salary of all employees. The null values in the commission column will be replaced by 0 and added to salary. Source: CoolInterview.com


whrerever the commission is null, it is replaced by 0 & added to the salary. Source: CoolInterview.com

Answered by: Prasheel | Date: 7/1/2009 | Contact Prasheel Contact Prasheel

NVL-by this we replace the null value by 0,if we will not do this then any operation by null result will be null,if we'll not convert this , and comm is null then always the addition of sal+comm will be null. Source: CoolInterview.com

Answered by: Shabbir Alam | Date: 8/18/2009 | Contact Shabbir Alam Contact Shabbir Alam

This will display salary + Commission for all emp. for records with no comm it will give only the salary Source: CoolInterview.com

Answered by: Anindya | Date: 9/3/2009 | Contact Anindya Contact Anindya

SELECT SAL + NVL(COMM,0) FROM EMP
It show sum of(sal and comm)column.if 'comm' column is null then NVl set 0 on that fields. Source: CoolInterview.com

Answered by: Manoj | Date: 10/31/2009 | Contact Manoj Contact Manoj

The NVL function is used to replace NULL values by another value.
case1
comm = null
function replace the null value as 0
apply comm = 0
sal + comm = sal
case2
comm = value
sal + comm = total(sal + comm)

Source: CoolInterview.com

Answered by: vikneswaran | Date: 2/11/2010 | Contact vikneswaran Contact vikneswaran


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