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Here is a quick tip to add OR query and AND query to collection object. I am implementing this on product collection.

Getting product collection

// PRODUCT COLLECTION
$collection = Mage::getModel('catalog/product')->getCollection();

Adding AND query condition
Filtering collection to select only those products whose sku is like ‘ch’ AND status is equal to 1 (i.e. enabled status).

// AND QUERY
$collection->addAttributeToFilter('sku', array('like' => '%ch%'));
$collection->addAttributeToFilter('status', array('eq' => '1'));

Adding OR query condition

Filtering collection to select only those products whose sku is like ‘ch’ OR status is equal to 1 (i.e. enabled status).

// OR QUERY
$collection->addAttributeToFilter(array(
                array(
                    'attribute' => 'sku',
                    'like' => '%ch%'),
                array(
                    'attribute' => 'status',
                    'eq' => '1')
            ));

You may check the query statement with the following code

$collection->printLogQuery(true);