title: #1241 - Operand should contain 1 column(s) - why am i getting this?
body: <p>I am trying to run a query but I am getting the above error. can anyone let me know why am I getting it.</p>
  
  <pre><code>UPDATE `catalog_eav_attribute`
  SET `used_for_sort_by` = 1
  WHERE attribute_id = (
  SELECT * FROM `eav_attribute` WHERE `entity_type_id` = (SELECT `entity_type_id` FROM `eav_entity_type` WHERE `entity_model` = "catalog/product") AND `attribute_code` = "created_at");
  </code></pre>