title: "The data reader has more than one field" error in Entity Framework
body: <p>I'm executing this simple query with Entity Framework</p>
  
  <pre><code>db.Database.SqlQuery&lt;string&gt;("SELECT * FROM hospital");
  </code></pre>
  
  <p>But I got this error:</p>
  
  <blockquote>
    <p>The data reader has more than one field. Multiple fields are not valid for EDM primitive or enumeration types.</p>
  </blockquote>
  
  <p>What could be the problem?</p>