title: set decimal places of sum in sql
body: <p>I have a database I use for a debating competition I am trying to sort the standings out to see which schools will play off in the finals at the end of the semester.</p>
  
  <p>I have this working as shown below however I am not able to round the ptc field, it currently returns up to 4 decimal places eg 0.6667 if they have won 2 out of 3 debates.</p>
  
  <pre><code>    SELECT   t.id,
               t.name                  AS name,
               SUM(t.id  = d.winnerid) AS w,
               SUM(t.id != d.winnerid) AS l,
               SUM(t.id  = d.winnerid)/(SUM(t.id  = d.winnerid)+SUM(t.id != d.winnerid)) AS ptc
      FROM     debates AS d
          JOIN teams   AS t ON t.id IN (d.hostid, d.visitid)
      WHERE    d.visitid != -1
           AND d.debatedate &lt; CURDATE()
      GROUP BY t.id
      ORDER BY ptc DESC
  </code></pre>
  
  <p>I believe I have to use decimal(2,2) here however I am not able to get the syntax right I have tried a few diferent things like</p>
  
  <pre><code>SUM(t.id  = d.winnerid)/(SUM(t.id  = d.winnerid)+SUM(t.id != d.winnerid)) AS ptc decimal (2,2)
  </code></pre>
  
  <p>Am happy to provide more information about the tables if required but I don't think it is required?</p>