Subject: Database management system Explain in easy way with write  handwritten note a. What is lossy decomposition? Check whether the following decompositions are lossy or lossless. (i) Let R=ABCD, R1 = AD, R2 = AB, R3 = BE, R4 = CDE, R5 = AE, F={ A->C, B- >C, C->D, DE->C, CE->A} (ii) R (XYZWQ), FD= {X->Z, Y->Z, Z->W, WQ->Z, ZQ-> X, R1 (XW), R2 (XY), R3 (YQ) , R4 (ZWQ), R5 (XQ) b. Eliminate redundant FDs from (i) F={X->Y, Y->X, Y->Z, Z->Y, X->Z, Z->X} (ii) F = {X->YZ, ZW->P, P->Z, W->XPQ, XYQ, YW, WQ ->YZ}

Subject: Database management system

Explain in easy way with write  handwritten note

a. What is lossy decomposition? Check whether the following decompositions are lossy or lossless.

(i) Let R=ABCD, R1 = AD, R2 = AB, R3 = BE, R4 = CDE, R5 = AE, F={ A->C, B- >C, C->D, DE->C, CE->A}

(ii) R (XYZWQ), FD= {X->Z, Y->Z, Z->W, WQ->Z, ZQ-> X, R1 (XW), R2 (XY), R3 (YQ) , R4 (ZWQ), R5 (XQ)

b. Eliminate redundant FDs from

(i) F={X->Y, Y->X, Y->Z, Z->Y, X->Z, Z->X}

(ii) F = {X->YZ, ZW->P, P->Z, W->XPQ, XYQ, YW, WQ ->YZ}