擅长:python、mysql、java
<p>这个问题已经回答了<a href="https://stackoverflow.com/questions/3373565/select-a-count-using-django-model">here</a></p>
<p>示例:</p>
<pre><code>>>> Model.objects.count()
42
>>> Model.related_set.count()
102
>>> Model.related_set.filter(blah=42).count()
3
</code></pre>