diference between -1 or 1- phpmyadmin
what is the difference between the values in list that is showed below. For example -1 / 1- ?

there is any difference?

![enter image description here][1]


  [1]: http://i.stack.imgur.com/emGZB.png

thanks
diference between -1 or 1- phpmyadmin
===

what is the difference between the values in list that is showed below. For example -1 / 1- ?

there is any difference?

![enter image description here][1]


  [1]: http://i.stack.imgur.com/emGZB.png

thanks