title: How to make a specific complicated binding of two tables
body: <p>I have a single column dataframe with all possible IDs:</p>
  <pre><code>comment       ID 
   used         a1
   used         a2
   used         b1
   not_used     b11
   not_used     c1
  </code></pre>
  <p>I get dataframe from my database with same column &quot;ID&quot;. But in that dataframe, not all IDs might be. Here is example of that table:</p>
  <pre><code>ID    value
  a1     18
  a2     10
  b1     10
  </code></pre>
  <p>I want to bind those tw tables in that way, so IDs which were not in my table have value zero. And also I want to keep column comment accordingly. So, how to bind these two tables to get this:</p>
  <pre><code>
  comment       ID    value
   used         a1     18
   used         a2     10
   used         b1     10
   not_used     b11    0
   not_used     c1     0
  </code></pre>