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What are the addAttributeToFilter Conditionals in Magento?

Answer:

In Magento we can use addAttributeToFilter Conditions same as where in SQL.
Below are the all condtions:
Equals: eq
$_products->addAttributeToFilter('status', array('eq' => 1));

Not Equals - neq
$_products->addAttributeToFilter('sku', array('neq' => 'test-product'));

Like - like
$_products->addAttributeToFilter('sku', array('like' => 'UX%'));

One thing to note about like is that you can include SQL wildcard characters such as the percent sign.

Not Like - nlike
$_products->addAttributeToFilter('sku', array('nlike' => 'err-prod%'));

In - in
$_products->addAttributeToFilter('id', array('in' => array(1,4,98)));

When using in, the value parameter accepts an array of values.

Not In - nin
$_products->addAttributeToFilter('id', array('nin' => array(1,4,98)));

NULL - null
$_products->addAttributeToFilter('description', 'null');

Not NULL - notnull
$_products->addAttributeToFilter('description', 'notnull');

Greater Than - gt
$_products->addAttributeToFilter('id', array('gt' => 5));

Less Than - lt
$_products->addAttributeToFilter('id', array('lt' => 5));

Greater Than or Equals To- gteq
$_products->addAttributeToFilter('id', array('gteq' => 5));

Less Than or Equals To - lteq
$_products->addAttributeToFilter('id', array('lteq' => 5));

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