title: Return the number of rows expected for a group by query
body: <p>I would like to get the <code>number of rows</code> returned from a mysql query that uses <code>group by</code>.
  table </p>
  
  <pre><code>CREATE TABLE IF NOT EXISTS TestRunSteps (
  `idTestRunSteps` INT UNSIGNED NOT NULL AUTO_INCREMENT ,
  `idUsersExecBy` VARCHAR(10) NULL ,
  `LastExecUserIPV4` INT UNSIGNED NULL ,
  PRIMARY KEY (`idTestRunSteps`);
  
  SELECT count(*)
  from proj1_db.TestRunSteps
  group by idUsersExecBy,LastExecUserIPV4
  </code></pre>
  
  <p>returns</p>
  
  <pre><code> 3,000002,3232236222 
   1,000003,3232236222 
   5,000004,3232236222 
  </code></pre>
  
  <p>What I would like to have is a simple <code>3</code> - for 3 rows. Please tell me how</p>