title: KDB: select rows based on value in one column being contained in the list of another column
body: <p>very simple, silly question.  Consider the following table:</p>
  
  <pre><code>tt:([]Id:`6`7`12 ;sym:`A`B`C;symlist:((`A`B`M);(`X`Y`Z);(`H`F`C)))
  
  Id  sym symlist
  ---------------
  6   A   `A`B`M
  7   B   `X`Y`Z
  12  C   `H`F`C
  </code></pre>
  
  <p>I would like to select all rows in tt where the element in sym is contained in the list symlist.  In this case, it means just the first and third rows.  However, the following query gives me a type error.</p>
  
  <pre><code>select from tt where sym in symlist
  (`type)
  </code></pre>
  
  <p>Whats the proper way to do this?  Thanks</p>