In module's admin grid I am using this code to get collection and group them by customer id

$collection = Mage::getModel('referafriend/statistics')->getCollection();

but here i have to use renderer and filter functions for customer info like name and email against each entity_id. i want to join customer model with my module's table. for this i have written this code

 $collection = Mage::getModel('customer/customer')->getCollection()
$collection->getSelect()->join(array('refer' => 'table_name'),'refer.entity_id = e.entity_id'

but it gives me this error

SQLSTATE[23000]: Integrity constraint violation: 1052 Column 'entity_id' in group statement is ambiguous

any help will be highly appreciated.

  • 1
    it should be ->group('e.entity_id');
    – Amit Bera
    Commented Oct 16, 2014 at 11:12
  • You should add this as an answer with some detail on why you need the e. Commented Oct 16, 2014 at 11:24
  • Sorry for this silly mistake. @AmitBera thanks for your help and please add this as answer so that question could be closed.
    – Haris
    Commented Oct 16, 2014 at 11:38

1 Answer 1


You need to add table name in group by condition.As you did not added on conditions table name at table group('entity_id') so query did not find columns name


Logic is:

  • 1
    In addtion, if you need to group by multiple fields, the just add more -> group() clauses ->group('field1') ->group('field2');
    – GregC
    Commented Mar 24, 2016 at 21:53
  • I want order unique products using group by. I have 2 order with 2 same order item. Currently, it is displayed 4 rows in the grid. But I need 2-row using group by. Commented Dec 17, 2019 at 7:13
  • Share your code
    – Amit Bera
    Commented Dec 17, 2019 at 7:55
  • $collection = $object_manager->create('\Magento\Sales\Model\Order\Item')->getCollection(); $collection->getSelect()->join( ['order' => $this->getTable('sales_order')], 'order.entity_id = main_table.order_id and (if(main_table.parent_item_id IS NULL,main_table.price != 0.0000,main_table.parent_item_id IS NULL))', [ 'order_number' => 'order.increment_id', 'order_store_id' => 'order.store_id', ] ); Commented Dec 17, 2019 at 8:32
  • I want to group by parent_item_id order wise. Commented Dec 17, 2019 at 8:36

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