title: postgresql sequence nextval in schema
body: <p>I have a sequence on postgresql 9.3 inside a schema.</p>
  <p>I can do this:</p>
  <pre><code>SELECT last_value, increment_by from foo.&quot;SQ_ID&quot;;`
  </code></pre>
  <pre><code>last_value | increment_by
  ------------+--------------
            1 |            1 (1 fila)
  </code></pre>
  <p>But this doesn't work:</p>
  <pre><code>SELECT nextval('foo.SQ_ID');
  </code></pre>
  <pre><code>ERROR:  no existe la relación «foo.sq_id»
  LÍNEA 1: SELECT nextval('foo.SQ_ID');
  </code></pre>
  <p>What is wrong ?</p>
  <p>It says that  not exist the relation <code>foo.sq_id</code>, but it exists.</p>