DATABRICKS CLEANROOMS

Data Engineering

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Hi Team,

I have a few questions regarding Databricks Cleanrooms:

For onboarding first-party data, does the collaborator need a Databricks account with an enabled UC workspace?
How is it useful for activating data for retargeting or prospecting use cases?
For analytics, can analysts use queries and insights templates to generate insights by joining first-party data?
Since Databricks Cleanroom is powered by Delta Sharing, does the data need to be in Delta format for sharing with collaborators? Can it also be in Parquet format, or does it strictly have to be Delta? Additionally, can the cloud region be any (AWS, Azure, GCP)?

Thank you!