title: Subtraction between two sql queries
body: <p>I have 2 queries in MS SQL that return a number of results using the COUNT function.</p>
  
  <p>I can run the the first query and get the first result and then run the other one to get the other result, subtract them and find the results; however is there a way to combine all 3 functions and get 1 overall result</p>
  
  <p>As in:  run sql1 run sql2 run SQL3 (sql1-sql2)?....</p>
  
  <p>I tried them with xxxx as a function but no luck.</p>