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#ask-questions
Title
# ask-questions
w

white-fireman-22476

07/11/2023, 10:11 AM
When you set up your data source you can set the identifier join https://docs.growthbook.io/app/datasources#identifier-join-tables
d

damp-printer-48360

07/11/2023, 11:35 AM
So in this case, we would only use the
deviceId
then? That’s a bit weird: if a known user logs in from a different device (i.e. different
deviceId
), they could see a different variation, despite having the same
user_id
.
My idea was to create 2 experiments: • the first one using the user ID (
guid
) • the second one using the
deviceId
if the
guid
is not provided
Something like this:
f

fresh-football-47124

07/11/2023, 3:36 PM
that will cause re-radomization
typically the anon id or device id is the same for that user across the login event where they get the user id
so if you want all users, use the device id.
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