Data modeling

Question

• I have a data with with multiple tables .there is no unique key in all of them. But each table contains 2 columns with same values like date ,model name, model code .I joined all tables with date, model name, Model code .
• But when i try to apply a filter for the whole page or slicer for a page then it doesn't filter out all values.it can filter values only from the table where i picked a slicer .
• Individually table visual work well . when i join 2 or more tables filter doesn't work .
• How should i join tables .