title: KDB: How to make convert a table column into a list?
body: <p>if I have a list and table:</p>
  
  <pre><code>a:("12";"34";"56")
  
  bb:([]c:("90";"12";"65"))
  </code></pre>
  
  <p>And I do this:</p>
  
  <pre><code>a except (select c from bb)
  </code></pre>
  
  <p>I get the following error:</p>
  
  <pre><code>length
  [5]  (.q.except)
  
  [4]  a except (select c from bb)
  </code></pre>
  
  <p>Perhaps (select c from bb) is still a table? How do I convert a column to a list so that the except statement works?</p>