Question

Consider the tables R (A, B, C), T(D,E,F), S(G, H) and U(A,D, G, I)
where A, D and G in
U are foreign keys referring to the primary keys with the same names.
Show an
initialquery tree for the following query and optimize it using the rules of
heuristics:
select B, E, G, H, I
from R, T, S, U
where R.A = U.A
and T.D = U.D and S. G = U.G
and RC = 'TEXT' and U.I > 20 and T.E = 25​

Answer 1

Answer:

nice quantity of questions

Explanation:

kkkkkkkkkkkkkkkkkkkkkkkkk kkkkkkkkkkkkkkkkkkkkkkkkk kkkkkkkkkkkkkkkkkkkkkkkkk kkkkkkkkkkkkkkkkkkkkkkkkk you are not the