title: Mysql adding new column for the selection
body: <p>I have the following table    </p>
  
  <pre><code>+-----+------------------+-------------+
  | id  | datenum          | F1_baro_20_ |
  +-----+------------------+-------------+
  |   1 | 734152.000000000 |     1005.21 |
  |   2 | 734152.006944445 |     1005.26 |
  +-----+------------------+-------------+
  </code></pre>
  
  <p>When I make a selection I want to add one more column.</p>
  
  <p>For example</p>
  
  <pre><code>SELECT id,datenum, F1_baro_20_ FROM test
  </code></pre>
  
  <p>And I want to add a column, something like this:</p>
  
  <pre><code>SELECT id,datenum, F1_baro_20_, new_column=1 FROM test
  
  +-----+------------------+-------------+------------+
  | id  | datenum          | F1_baro_20_ |new_column  |
  +-----+------------------+-------------+------------+
  |   1 | 734152.000000000 |     1005.21 |       1    |
  |   2 | 734152.006944445 |     1005.26 |       1    |
  +-----+------------------+-------------+------------+
  </code></pre>