dcsimg
Login | Register   
RSS Feed
Download our iPhone app
TODAY'S HEADLINES  |   ARTICLE ARCHIVE  |   FORUMS  |   TIP BANK
Browse DevX
Sign up for e-mail newsletters from DevX

By submitting your information, you agree that devx.com may send you DevX offers via email, phone and text message, as well as email offers about other products and services that DevX believes may be of interest to you. DevX will process your information in accordance with the Quinstreet Privacy Policy.


Tip of the Day
Language: SQL Server
Expertise: Beginner
Nov 30, 1999

WEBINAR:

On-Demand

Application Security Testing: An Integral Part of DevOps


Values Resulting to Null

Question:
I want to add two numeric fields with values like these:

Example 1: One field named Amount contains 565.25 and other field named Ticket contains null.

 
select amount + ticket 
The result fetched is null. But the result should be 565.25 instead of null.

Example 2:

 
Select 565.25 + null
Results to null as well. How can I fix this ?

Answer:
As you have discovered, the result of any operation where an operand is null is NULL!

This is overcome by taking a little extra care in your table create statement. What is required is provision for a default value against a column that is not allowed to be null. In your case, you need a default value of 0 (zero) so that you can derive the sums you envision. This will not work if one of the parties to the operation is null.

DevX Pro
 
Comment and Contribute

 

 

 

 

 


(Maximum characters: 1200). You have 1200 characters left.

 

 

Sitemap
×
We have made updates to our Privacy Policy to reflect the implementation of the General Data Protection Regulation.
Thanks for your registration, follow us on our social networks to keep up-to-date