Can we create primary key in MongoDB?

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Tags

1. #mongodb
2. #fields
3. #unique
4. #reserved
5. #setting
6. #field
7. #create
8. #behaviour
9. #primary
10. #rdbms
11. #thinking
12. #default
13. #value
14. #achieving
15. #based
16. #treat
17. #which
18. #index
19. #custom