title: q/KDB Selecting multiple symbols using functional select
body: <p>I am trying to select multiple symbols using function select but it is throwing an error  :</p>
  
  <pre><code>d:([] s:5#`v`b ; p:5?10)
  ?[d;enlist (in;`s;(),`v`b);0b;()]
  'b
  </code></pre>
  
  <p>however, when I select a single symbol, it returns correct data  </p>
  
  <pre><code>?[d;enlist (in;`s;(),`v);0b;()]
  s p
  ---
  v 8
  v 4
  v 2
  </code></pre>
  
  <p>what exactly is wrong with my query?</p>