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    <p>To use <code>addAttributeToFilter()</code> with an <code>OR</code> condition you can pass an array of arrays like this:</p> <pre><code>$collection-&gt;addAttributeToFilter( array( array( 'attribute' =&gt; 'name_of_attribute_1', 'null' =&gt; 'this_value_doesnt_matter' ), array( 'attribute' =&gt; 'name_of_attribute_2', 'in' =&gt; array(115, 116) ) ) ); </code></pre> <p>The definition of filtering against <code>NULL</code> keywords may look somewhat confusing at first glance, but it's plain simple, once you get used to it.</p> <p>Magento supports two filter types of type <code>string</code>, namely <code>'null'</code> and <code>'notnull'</code>, for comparisions against <code>NULL</code> keywords. </p> <p>Be aware, that even though you need to pass key=>value pairs (because an associative array is used), the value will be always ignored, when filter type <code>'null'</code> or <code>'notnull'</code> is used.</p> <h2>Example</h2> <pre><code>var_dump( Mage::getModel('catalog/product') -&gt;getCollection() -&gt;addFieldToFilter( array( array( 'attribute' =&gt; 'description', 'null' =&gt; 'this_value_doesnt_matter' ), array( 'attribute' =&gt; 'sku', 'in' =&gt; array(115, 116) ) ) ) -&gt;getSelectSql(true) ); </code></pre> <p>The output of the dump may vary depending on your shop configuration (attribute ids, count of stores, etc.), but the <code>OR</code> logic in the <code>WHERE</code> clause should always remain the same:</p> <pre><code>SELECT `e`.*, IFNULL(_table_description.value, _table_description_default.value) AS `description` FROM `catalog_product_entity` AS `e` INNER JOIN `catalog_product_entity_text` AS `_table_description_default` ON (_table_description_default.entity_id = e.entity_id) AND (_table_description_default.attribute_id='57') AND _table_description_default.store_id=0 LEFT JOIN `catalog_product_entity_text` AS `_table_description` ON (_table_description.entity_id = e.entity_id) AND (_table_description.attribute_id='57') AND (_table_description.store_id='1') WHERE ( (IFNULL(_table_description.value, _table_description_default.value) is NULL) OR (e.sku in (115, 116)) ) </code></pre>
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    1. USJürgen Thelen
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    1. POMagento: Combine eq and is null in addAttributeToFilter
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    1. COSorry, but i want filter not two different attributes... The result of your example: name_of_attribute_1 IS NULL AND (name_of_attribute_2 = 115 OR name_of_attribute_2 = 116) but i want: (name_of_attribute_1 IS null OR name_of_attribute_1 = 115 OR name_of_attribute_1 = 116). That is not possible with your code.
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    2. CO@timopeschka: Strange, for me it works perfectly. I added an example and its output. How does your `WHERE` clause look when executing my example?
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      1. USJürgen Thelen
    3. COWhat type of collection are you using? Some, like the flattened sales tables, have their own version of the `addAttributeToFilter` method since they are not actually EAV collections. That might explain the discrepancy you are seeing.
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