/td>
  <td>boolean</td>
  <td>whether this column can be null.</td>
  <td><a href="/doc/api/1.0/CDbColumnSchema">CDbColumnSchema</a></td>
</tr>
<tr class="inherited" id="dbType">
  <td><a href="/doc/api/1.0/CDbColumnSchema#dbType-detail">dbType</a></td>
  <td>string</td>
  <td>the DB type of this column.</td>
  <td><a href="/doc/api/1.0/CDbColumnSchema">CDbColumnSchema</a></td>
</tr>
<tr class="inherited" id="defaultValue">
  <td><a href="/doc/api/1.0/CDbColumnSchema#defaultValue-detail">defaultValue</a></t