Mongodb Query To select records having a given key

Question

The records in my database are

{\"_id\":\"1\",\"fn\":\"sagar\",\"ln\":\"Varpe\"}

{\"_id\":\"1\",\"fn\":\"sag\",\"score\":\"10\"}

{\"_id\":\"1\",\"ln\":\"ln         


        

Answer 1

I had the same problem and

db.coll.find({"mykey":{'$exists': 1}})

worked for me