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Hey Dan - if I understand correctly, your Experiment Assignment Query has the

projectId

twice, presumably in the

FROM

clause? E.G. Something like

projectId.projectId.experiment_viewed

? If so, you can definitely customize that query without having to build a new data source. You can go to the Data Source, and on that page, you'll see a section for the Experiment Assignment Queries, and you can customize it/them.

Thanks that worked