title: Fetching data from entity using nspredicate
body: <p>I have core data entity called "Songs" which contains details of different songs details. One of the attribute of this entity is "Language". I want to fetch all songs with Language Spanish. But if number of songs with Spanish is zero, then it should fetch all songs with default language, thats english. Is this possible through single NSPredicate if I know default language and needed language.</p>