Answer to Question #306195 in Databases | SQL | Oracle | MS Access for SERGEI HOOD

Question

1)proof the following rule by using university database

 sigma <condition1>(sigma < condition2>

(R)) = sigma

<condition2>

(sigma < condition1>

(R)) .

2)proof the following rule by using university database

sigma <cond1>(sigma < cond2>

(sigma <cond3>(R))

= sigma <cond1>

AND < cond2> AND < cond3>(R)))

Answer 1

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