title: mysql query: Incorrect key file for table
body: <p>I run this query:</p>
  
  <pre><code>SELECT v.autor, v.titlu,  'http://85.25.176.18/resursecrestine-download' + v.`link` 
  FROM  `video_resurse` v, predicimp3 p
  WHERE v.titlu = p.titlu
  ORDER BY v.autor
  </code></pre>
  
  <p>all it's ok.</p>
  
  <p>But when I replace "=" with "!=" it takes very long...and instead of results it gives me:</p>
  
  <pre><code>#126 - Incorrect key file for table '/tmp/#sql_42c5_0.MYI'; try to repair it 
  </code></pre>
  
  <p>Why?</p>