title: "ORA-00923: FROM keyword not found where expected" Encountered in my oracle query
body: <pre><code>      SELECT TITLE, CONCAT(TO_CHAR(SUM((COST-RETAIL)/COST)*100), '100'), '%') 
        AS "Markup"
        FROM BOOKS
        GROUP BY TITLE; 
  </code></pre>
  
  <p>::THE GOAL::<br>
  I'm trying to calculate the mark-up for my products (books). </p>
  
  <p>::ZE PROBLEM::<br>
  When I try to run the stated SQL, I get the error </p>
  
  <blockquote>
    <p><em>ORA-00923: FROM keyword not found where expected</em></p>
  </blockquote>
  
  <p>In advance I thank you for any and all input on my issue.</p>