... (a,2,3,4 ,6) }(d) {(a,2,3,4,5), (2,a,3,4,5), (a,2,3 ,6, 5)}(e) {(a,2,3,4,5), (2,a,3,7,5), (a,2,3,4 ,6) }(f) {(a,2,3,4,5), (2,a,3,4,5), (a,2,3 ,6, 5), (a,2,3 ,6, 6)}(g) {(a,2,3,4,5), (a,2,3 ,6, 5), (a,2,3 ,6, 6), ... NOTESTextbook presentations of dependency theory and its use in database design include [3, 38,4 36, 443, 65 6]. Good survey articles on the topic include [66 3, 355].FDs were introduced in [1 56] , ... and developed furtherin Sections 16. 3 through 16. 6. In Section 16. 3 we present examples that highlight basicalternatives in index selection. In Section 16. 4 we look closely at the important...