Magento Blog | For Simple Technical Solutions

When trying to filter sales order grid with From and To dates it was redirecting to dashboard.after that again i tried to open sales order grind it is generating reports in reports file it showing. "Integrity constraint violation: 1052 Column 'created_at' in where clause is ambiguous" means it is finding a another created_at field. because when we adding or joining the other table then it has also a field named as created_at. So below is the  solution for this error. magento that created_at is of the main_table not of my custom table. Find the below code in the sales order grid.php file. $this->addColumn('created_at', array(            'header' => Mage::helper('sales')->__('Purchased On'),             'index' => 'created_at',             'type' => 'datetime',             'width' => '100px',         )); just replace the code with below one.  $this