Question: Relational Algebra EXERCISE6 Consider the following relation R (A, B, c, D, E) Select which of the following projections have the same cardinality as R

Relational Algebra

Relational Algebra EXERCISE6 Consider the following relation R (A, B, c, D, E) Select which of the following projections have the same cardinality as

EXERCISE6 Consider the following relation R (A, B, c, D, E) Select which of the following projections have the same cardinality as R elation R (A, B, c, D,E) 1. PROJ A.B.cD R) 2. PROJ Ac (R) 3. PROJ B.c (R) 4. PROJ c (R) 5. PROJ c.D (R) C,D 21 EXERCISE7 1. PROJ A,B(R) 2. PROJ e (R2) 3. PROJB, ) Ri (3,0, ) , with IR,1-100 and a referential integrity constratin between C and R2 .R2 (D, E, F), with R22004. PROJ c(R3) and a referential integrity constratin between F and R2 R3 ( G, H, I), with |R3 50 Find the cardinality of the 6. R, JOINc-DR2 following expressions 23

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4. Explain the strengths and weaknesses of each approach.

d. Describe any challenges in trying to communicate. If there were no challenges, explain why you think it was so easy.

3. Identify the methods used within each of the three approaches.