title: Sub-Query Returns More than one row
body: <p>I have a subquery in my SELECT statement that returns more than one row, but I need both values.  Is there anyway to concatenate the multiple values with a comma to make the outside query think the subquery is only returning one value?</p>
  
  <p>Example of my query:</p>
  
  <pre><code>select o.id,
     (select v.value v from values v join attributes a on v.att_id=a.att_id where a.att_id='100' and v.id=o.id)
  from objects o
  where o.class_id='GGzX';
  </code></pre>
  
  <p>Thanks in advance!</p>