Add field to posts (checkbox) that only one post can have

I am trying to add a field to WordPress posts (not pages) which would simply include a label and a checkbox. Something like: Make this the sticky post? If check, the key should be set to TRUE or something that is easily accessible. The problem is, however, that I only want one post to have possibly the TRUE value. This means, when I have checked the field in post-1, and afterwards I check that field in post-2, post-1’s field value should be set to FALSE so that only one post can have TRUE at the same time.

get_option() is not working even db contains the corresponding option_name and option_value

First of all, this is not a plugin specific problem. I wonder why this might happen? I am using @bainternet’s Tax Meta Class for saving Taxonomy Meta using the options table. I uploaded my contents from localhost (XAMPP Windows 5.5.19 environment ), I found my data in options table. Everything was working fine.