How to combine(union all) two collections in one collection?

Question

MongoDB

for example I have collection one with this data:

"_id": "60d75ed08af96529bf605030"
"Fname": "some name"
"Lname": "some last name"
"Age": "20"
"sex": "Woman"
"Previous_job": "Arsen"
"worksInShifts": "undefined"
"ShopAddress": "Shevchenka 43"
"NumberOFCashRegister": "8"
"__v":  "0"

and collection two with this data:

"_id": "60d75ed08af96529bf605030"
"Fname": "some name"
"Lname": "some last name"
"Age": "20"
"sex": "Woman"
"Previous_job": "Arsen"
"worksInShifts": "undefined"
"ShopAddress": "Shevchenka 43"
"NumberOFCashRegister": "8"
"__v":  "0"

(yes, these collections is the same)
I know how I can make it in MySQL using UNION ALL but I don't know how to make it in mongo db,
how can I combine these collections in one collection?
can give answer in Russian or Ukraine

Answer 1

Since version 4.4, the unionWith operation has appeared there https://docs.mongodb.com/manual/reference/operator...