Database
[{"_id":101,"name":"ABC","students":[{"name":"john","age":10,"city":"CA"},{"name":"danial","age":15,"city":"KA"}]},{"_id":102,"name":"DEF","students":[{"name":"adam","age":20,"city":"NY"},{"name":"johnson","age":12,"city":"CA"}]}]
Query
/***/db.collection.find({students:{$elemMatch:{city:"CA",}}})