There are event described in firebase manual. Some diffrencies:
value
- load all childs at first
- if something is changed/create/remove
- always load all child
child_added
- load all childs at first
- only if child is created
- load only created child
child_removed
- only if child is removed
- load only removed child
child_changed
- if something is changed
- if is create or remove child´s child - but only if the remove don´t remove all child
- load only changed child
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