What does the following query do? SELECT SAL + NVL(COMM,0) FROM EMP; - This displays the total salary of all employees. The null values in the commission column will be replaced by 0 and added to salary.

Search Interview Questions

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
Rating	(0.3) By 5683 users
Added on	10/12/2009
Views	53716
Rate it!

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

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

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

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

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

If you have the better answer, then send it to us. We will display your answer after the approval

Rules to Post Answers in CoolInterview.com:-

There should not be any Spelling Mistakes.
There should not be any Gramatical Errors.
Answers must not contain any bad words.
Answers should not be the repeat of same answer, already approved.
Answer should be complete in itself.

	Related Questions	View Answer
	Which date function is used to find the difference between two dates?	View Answer
	Why does the following command give a compilation error? DROP TABLE &TABLE_NAME;	View Answer
	What is the advantage of specifying WITH GRANT OPTION in the GRANT command?	View Answer
	What is the use of the DROP option in the ALTER TABLE command?	View Answer
	What is the value of comm and sal after executing the following query if the initial value of ?sal? is 10000 UPDATE EMP SET SAL = SAL + 1000, COMM = SAL*0.1;	View Answer
	What is the use of DESC in SQL?	View Answer
	What is the use of CASCADE CONSTRAINTS?	View Answer
	Which function is used to find the largest integer less than or equal to a specific value?	View Answer
	What is the output of the following query SELECT TRUNC(1234.5678,-2) FROM DUAL;	View Answer

Please Note: We keep on updating better answers to this site. In case you are looking for Jobs, Pls Click Here Vyoms.com - Best Freshers & Experienced Jobs Website.

View All SQL Interview Questions & Answers - Exam Mode / Learning Mode

Post your answer here