I got a probably really simple question but I couldn´t find a solution for now. I found heaps of questions etc. but for now nothing which would be what I need.

I am trying to use a query on magento but I´m wondering how I run the SQL command.

I want to run something like

select substr(sku,1) as sku 
.....and so on....

and then I want the result to be written in a .txt file


I want to run the following command

select substr(sku,1) as sku 
  from catalog_product_entity
  where sku like 'S%'
  order by sku asc;

and then write that in a .csv or .txt file. Where does the code go and where will the file be? I need a full explanation if possible.

1 Answer 1


SUBSTRING returns a specified number of characters from a particular position of a given string.

In magento,you can use the function getSubstringSql($stringExpression, $pos).It is PDO library function. By which you can create sub string of a field.

$stringExpression may be a field name or SQL

   public function getSubstringSql($stringExpression, $pos, $len = null)
        if (is_null($len)) {
            return new Zend_Db_Expr(sprintf('SUBSTRING(%s, %s)', $stringExpression, $pos));
        return new Zend_Db_Expr(sprintf('SUBSTRING(%s, %s, %s)', $stringExpression, $pos, $len));


$Collection = Mage::getModel('catalog/product')->getCollection();

You can try this

$Collection = Mage::getModel('catalog/product')->getCollection()->addAttributeToSelect('sku');

Update: According to your chat you need use like in condition

$Collection = Mage::getModel('catalog/product')->getCollection()->addAttributeToSelect('sku')->addAttributeToFilter('sku', array(
   'like' => 'A%',


According your update

I have add new columns to using zend expression

$productCollection=Mage::getModel('catalog/product')->getCollection()->addAttributeToSelect('sku')->addAttributeToFilter('sku', array(
   'like' => 'A%'));

$write = Mage::getSingleton("core/resource")->getConnection("core_write");
$requestPathField = new Zend_Db_Expr($write->quoteIdentifier('sku'));

echo $productCollection->getSelect()->columns(array('mysku' =>  $write->getSubstringSql($requestPathField,1)));
foreach($productCollection as $product):
echo $product->getMysku().'<br/>';

See at http://www.magentocommerce.com/wiki/1_-_installation_and_configuration/using_collections_in_magento

  • Thanks for that quick response, but can I not run a normal SQL command somehow on my Magento database?
    – seb
    Feb 23, 2015 at 13:20
  • 1
    Yes.you can do this and it is ok whenever want to only fetch sku fields.Please explain what is your requirement
    – Amit Bera
    Feb 23, 2015 at 13:23
  • I want to get a list from all the products where the SKU starts with a specific letter So I thought I can do Substr(sku,1) as Sku from xxxx where sku like 'A%'; But where do I run this so that I will get a file at the end containing all the products?
    – seb
    Feb 23, 2015 at 14:22
  • Amit I updated my description can you help me again.
    – seb
    Feb 24, 2015 at 15:14
  • 1
    please check my update ....
    – Amit Bera
    Feb 25, 2015 at 18:09

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