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Selecting records where column is NULL


I'm trying to use the ORM to select records from the database where the column value is NULL. Does anyone know how to achieve that? I've tried:

Groups::find(array( 'conditions' => 'parent_id=NULL' ));

Groups::find(array( 'conditions' => 'parent_id=?0', 'bind' => array(null) ));

Groups::find(array( 'conditions' => 'parent_id=?0', 'bind' => array(new \Phalcon\Db\RawValue('NULL')) ));

Thank You!


if you try with parent_id IS NULL and parent_id IS NOT NULL ?

It worked perfectly! Thanks!