title: MySQL SELECT INTO OUTFILE and User Defined Variables
body: <p>Any idea why this fails in MySQL 5.1:</p>
  
  <pre><code>SET @LOAD_TIME = UNIX_TIMESTAMP();
  SET @OUTFILE = CONCAT(CONCAT('/tmp/outfile_', @LOAD_TIME), '.sql');
  
  SELECT *
  FROM `tableA`
  INTO OUTFILE @OUTFILE;
  </code></pre>
  
  <p>Is it a limitation of MySQL's SELECT or am I missing something here?</p>