title: Q/Kdb: Combining two columns to create a new column as list
body: <p>I needed a help in creating a new column as a list using two pre-existing column</p>
  
  <pre><code>CcyPair, Amount1, Amount2 
  USDJPY   1666     2400
  EURUSD   2344     3000
  </code></pre>
  
  <p>I want new output as </p>
  
  <pre><code>CcyPair, Amount1, Amount2, NewAmount
  USDJPY   1666     2400     1666 2400
  EURUSD   2344     3000     2344 3000
  </code></pre>
  
  <p>I tried doing 
      Select CcyPair,Amount1,Amount2,NewAmount:(Amount1;Amount2) 
      from table </p>
  
  <p>but getting length error</p>
  
  <p>Any ideas how this can be resolved.
  Thanks</p>