Multiple database query if user_id exists

I have 3forms that fill in 3 tables in mySQL (CAL-Client-Mini-Intake, Caminos-2-application, Caminos-CNA-Client-Intake).

Each table has a filed called ‘user_id’. I would like to us php to link to each form that has been filled out. Is there a best practice way to go about this, or do I make 3 separate sql calls?

more details, please

and remember, this is the databases forum, not the php forum

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