title: MySQL INSERT IGNORE not working
body: <p>Here's my table with some sample data</p>
  
  <pre><code>a_id | b_id
  ------------
    1    225
    2    494
    3    589
  </code></pre>
  
  <p>When I run this query</p>
  
  <pre><code>INSERT IGNORE INTO table_name (a_id, b_id) VALUES ('4', '230') ('2', '494')
  </code></pre>
  
  <p>It inserts both those rows when it's supposed to ignore the second value pair <em>(2, 494)</em></p>
  
  <p>No indexes defined, neither of those columns are primary.</p>
  
  <p>What don't I know?</p>