title: Mysql query for selecting min/max values in a varchar field
body: <p>So I have a varchar column which is supposed to store product prices( don't ask me how I ended up with that, but now I have no option of changing this...sigh ), It can also be blank, or contain one of the texts(literally) "null","OUT" where both represents a price of 0. What is the best and most efficient way to find the MIN and MAX value of this column?</p>
  
  <p>PS: I am open to php/mysql hybrid solutions, cause I need the most optimized and efficient way for this. This table is really huge...</p>