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#ask-questions
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# ask-questions
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full-kitchen-78538

10/25/2022, 8:41 PM
Hi everyone Im having trouble setting up experiments with growthBook. My app has a postgres database where all data is stored and we use mixpanel for event tracking. When I try to set up an experiment I get the error "relation "viewed_experiment" does not exist" , but I dont know why growthbook is trying to find that table? I never created or anything and in the docs theres nothing about it
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fresh-football-47124

10/25/2022, 8:47 PM
hi Maria - what data sources do you have defined?
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full-kitchen-78538

10/25/2022, 8:52 PM
I selected the postgres one for this experiment
but in neither of my added data sources I have that table
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fresh-football-47124

10/25/2022, 8:53 PM
right, we make some assumptions
are you using features to launch the experiments?
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full-kitchen-78538

10/25/2022, 8:53 PM
Yes
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fresh-football-47124

10/25/2022, 8:54 PM
what did you set for the trackingCallback ?
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full-kitchen-78538

10/25/2022, 8:54 PM
mixpanel
but the metrics im trying to check are on postgres
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fresh-football-47124

10/25/2022, 8:55 PM
I see - we currently don’t support joining one experiment across different data sources
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full-kitchen-78538

10/25/2022, 8:56 PM
hmmm so what you are saying is that I need to store the experimentid and variationid in a table in postgres?
in the trackingCallback instead of using mixpanel
?
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fresh-football-47124

10/25/2022, 8:58 PM
yes - so you can either push that metric to mixpanel, or also add a tracking call for postgres (you can add both mixpanel and postgres in that call - or use something like Segment or Rudderstack to do the pipelining)
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full-kitchen-78538

10/25/2022, 8:59 PM
Ok Thank you Graham
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