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Condition based Join of 3 tables

I am having 3 tables - A, B, C. I need 4 kinds of output Case 1 : If condition 1 and 2 both not satisfied : Sel from A Case 2 : If condition 1 satisfies : Sel A. from A Inner Join B Case 3 : If condition 2 satisfies : sel A. from A Inner Join C Case ...

join CASE switch