MCQS: Related to relationships DFD diagram Short: what roles are used explicitly in relationships (give two point) Unarry, trinary , binary operator ( there diagram and add true false for the statements) Theta Join and Simple (normal join) comparison and Mathematical notatation for theta Join Easy long, just had to re-order the DBA, Naive, Sophisticated users, Application programmers with their correct roles ( do understand the concept if them)