title: Sqlzoo SELECT within SELECT Tutorial #5
body: <p><strong>My Question is:</strong></p>
  
  <blockquote>
    <p>Germany (population 80 million) has the largest population of the
    countries in Europe. Austria (population 8.5 million) has 11% of the
    population of Germany.</p>
    
    <p>Show the name and the population of each country in Europe. Show the
    population as a percentage of the population of Germany.</p>
  </blockquote>
  
  <p><strong>My answer:</strong></p>
  
  <pre><code>SELECT name,CONCAT(ROUND(population/80000000,-2),'%')
  FROM world
  WHERE population = (SELECT population
                      FROM world
                        WHERE continent='Europe')
  </code></pre>
  
  <p>What I am doing wrong?
  Thanks.</p>