title: MySQL - 'Using index condition' vs 'Using where; Using index'
body: <p>I want to know difference between <code>Using index condition</code> and <code>Using where; Using index</code>.
  I think both method use index to fetch first result record set, and filter using WHERE condition.</p>
  
  <p><strong>Q1. What's the difference?</strong></p>
  
  <p><strong>Q2. Which is better?</strong></p>
  
  <p>Thank you.</p>