When should I use UNSIGNED and SIGNED INT in MySQL?

Question

When should I use UNSIGNED and SIGNED INT in MySQL ? What is better to use or this is just personal prefernce ? Because I\'ve seen it used like this;

id INT         


        

Answer 1

Basically with UNSIGNED, you're giving yourself twice as much space for the integer since you explicitly specify you don't need negative numbers (usually because values you store will never be negative).