How to exact match entire document?

Question

Exact matching subdocuments is easy, but is there a way to exact match entire document in a collection ?

I have a lot of documents with similar data, and I only need e

Answer 1

I really don't understand your question, can you explain it ?

If you want documents that doesnt have some fields you can use $exists.

For example, if you have...

{a: 1 , b: "1", c: true }
{a: 2, b: "2", c: false}
{a: null, b: "3" }

Then db.my_collection.find({a: {$exists: true}}); finds

{a: 1 , b: "1", c: true }
{a: 2, b: "2", c: false}

And db.my_collection.find({a: {$exists: false}}); finds

{a: null, b: "3" }