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1. How to retrieve a value from mongoDB, by its key name?    stackoverflow.com

I am new to mongoDB. I am using java and mongoDB. I have a json like, 

[{ "_id" : { "$oid" : "4ceb753a70fdf877ef5113ca"} , "HomeTown" : "Chatni" , 
"PhoneNumber" : { "CustName" ...

2. MongoDB Composite Key    stackoverflow.com

I'm just getting started with MongoDb and I've noticed that I get a lot of duplicate records for entries that I meant to be unique. I would like to know how ...