title: how to get 1 row and 6 rows and all rows from feature,regular,free category in product table?
body: <pre>
  book_table
  id    type        name .... ......
  1     feature     book 1 .... ....
  2     feature     book 2 ....  ...
  n     feature     book n .... ....
  ----------------------------------
  1     regular     book 1 .... ....
  2     regular     book 2 ... .....
  n     regular     book n .... ...
  ----------------------------------
  1     free        book 1 ....    .
  2     free        book 2 .. ......
  n     free        book n .........
  ----------------------------------
  </pre>
  
  <p>I want to get </p>
  
  <pre>
  id    type        name
  1     feature     book 1 .... ... 
  2     regular     book 1
  ..     ......     ......
  6     regular     book 6 ........
  7     free        all............
  </pre>
  
  <p>that's mean 1 row from feature, 6 row from regular, all row from free..</p>