Table filtering based on user role

Hello,
I am developing a Laravel + Bootstrap application. My database contains tables such as city, district and department. I want to set three authorization segments for users. For example, I want the city user to be able to see all departments, and the district user to be able to see only the list of departments in their district. However, I could not do this filtering. I would be happy if you help me.

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Use the WHERE clause in Page Properties of Radsystems Studio to check the conditions you need.