title: Create a Boolean column displaying comparison between 2 other columns in kdb+
body: <p>I'm currently learning kdb+/q.
  I have a table of data. I want to take 2 columns of data (just numbers), compare them and create a new Boolean column that will display whether the value in column 1 is greater than or equal to the value in column 2. </p>
  
  <p>I am comfortable using the update command to create a new column, but I don't know how to ensure that it is Boolean, how to compare the values and a method to display the "greater-than-or-equal-to-ness" - is it possible to do a simple Y/N output for that?</p>
  
  <p>Thanks. </p>