title: correct datatype for storing negative numbers
body: <p>I have to save the the value <code>-1</code>. Is for it more correct to use a data type of <code>tinyint(1)</code> or <code>tinyint(2)</code> and why? </p>
  
  <p>I know that I can also store with tinyint tinyint (1) many more digits, but I want to know what you use in my case.</p>