title: Only insert the data from the first table that doesn't exist in the second table
body: <p>I was trying to figure out how to insert the data to the second table from the first table, but I don't want to insert the existing data that the second table already had from previous injection. Is there any way to check before it inserts the data?</p>
  
  <p><strong>Here is what I have so far:</strong></p>
  
  <pre><code>INSERT INTO content2 (d1, d2, d3) SELECT d1, d2, d3 FROM content
  </code></pre>
  
  <p>I tried to put "LIMIT 1" into the query, but it didn't work. I'm not sure if I had it in the right place...</p>