How to cycle through the third-level column under the second-level column in DreamWeaver

How does Dream Weaver cycle through the secondary columns and call the third-level columns?

Dreamweaver (dedecms) loops to call the third-level column under the second-level column

Recommended learning: Dreamweavercms

The background has been established Good column. For the product display column, it was written like this before:

{dede:channelartlist  cacheid='channelsonlist' typeid=3 }
 <dd>
    <dl>
      <dt><a href="{dede:field name=&#39;typeurl&#39;/}">{dede:field name=&#39;typename&#39;/}</a></dt>
      <dd>
        <ul>
        {dede:channel type=&#39;sun&#39; row=&#39;10&#39; noself=&#39;yes&#39;}
        <li><a href="[field:typeurl/]">[field:typename/]</a></li>
        {/dede:channel}
        </ul>
      </dd>
    </dl>
  </dd>
 {/dede:channelartlist}

If the above code is used, the display of the front page will not be satisfactory. For secondary directories with subcategories, their subcategories will be displayed correctly, and those without subcategories will display their similar list.

This result is really puzzling.

Next, look at the second way of writing the code:

{dede:channelartlist typeid=3 }
 <dd>
    <dl>
      <dt><a href="{dede:field name=&#39;typeurl&#39;/}">{dede:field name=&#39;typename&#39;/}</a></dt>
      <dd>
        <ul>
         {dede:sql sql=&#39;Select * from `dede_arctype` where reid=~id~ ORDER BY id&#39;}
        <li><a href="[field:typedir function="cn_substr(@me,200,9) " /]">[field:typename/]</a></li>
        {/dede:sql}
        </ul>
      </dd>
    </dl>
  </dd>
 {/dede:channelartlist}

The result, of course, should be what you want, as shown below.

In this case, if there is a subclass, it will be displayed, but if there is not, it will not be displayed.

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