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.

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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.

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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 |

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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 |

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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 |

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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 |

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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 |

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