Data display problem.. small question from a newbie

hi guys,
        I have a table in which there are 7 column.
I have select all data from the table but in the time of display
I want to display last 5 column(just hide first 2 column)
The following code display all data(7 column):
<table>
<% for file_data in @file_datas %>
<tr>
  <% for column in FileData.content_columns %>

<% for column in FileData.content_columns[2 .. FileData.content_columns.length] %>