title: Insert missing records from one table to another using mysql
body: <p>I don't know why I am confused with this query.</p>
  
  <p>I have two table: <code>Table A</code> with <code>900</code> records and <code>Table B</code> with <code>800</code> records. Both table need to contain the same data but there is some mismatch.</p>
  
  <p>I need to write a mysql query to insert missing <code>100</code> records from <code>Table A</code> to <code>Table B</code>.</p>
  
  <p>In the end, both <code>Table A</code> and <code>Table B</code> should be identical.</p>
  
  <p>I do not want to truncate all the entries first and then do a insert from another table. So please any help is appreciated.</p>
  
  <p>Thank you.</p>