title: sqlalchemy simple example of `sum`, `average`, `min`, `max`
body: <p>For <em>sqlalchemy</em>, Who can gently give simple examples of <code>SQL</code> functions like <code>sum</code>, <code>average</code>, <code>min</code>, <code>max</code>, for a column (<code>score</code> in the following as an example).</p>
  
  <p>As for this mapper:</p>
  
  <pre><code>class Score(Base):
      #...
      name = Column(String)
      score= Column(Integer)
      #...
  </code></pre>