title: MySQL Index performance for decimal column type
body: <p>I searched everywhere but i couldn't find a proper answer about index on decimal columns types.</p>
  
  <p>I have a table (innodb) with reviews, column score is decimal(3,1) mean there will be a number between 0.0 and 10.0
  I have index on score column where i can order by desc my reviews.</p>
  
  <p>What are the advices you can give me to make a good index on a decimal column? Is there any changes i need to make or this will be the right way to do the index?</p>
  
  <p>Any infos are welcome</p>