Database Systems: The Complete Book (2nd Edition) :P238 5.4.8 Exercises for Section 5.4 Exercise 5.4.1: Let R(a,b,c), S(a,b,c), and T(a,b,c) be three relations. Write one or more Datalog rules that...

Extracted text: Database Systems: The Complete Book (2nd Edition) :P238 5.4.8 Exercises for Section 5.4 Exercise 5.4.1: Let R(a,b,c), S(a,b,c), and T(a,b,c) be three relations. Write one or more Datalog rules that define the result of each of the following expressions of relational algebra: a) RUS. b) R n S. 5.4. RELATIONAL ALGEBRA AND DATALOG 239 c) R - S.d) (RU S) - T. ! e) (R - S)n (R-T). f) n a ,b(R )- ! g) * a „b (R ) n PU (a,b }{ ^b A S )) -