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When you set up your data source you can set the identifier join <https://docs.growthbook.io/app/datasources#identifier-join-tables|https://docs.growthbook.io/app/datasources#identifier-join-tables>

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

image.png

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.