Exercise IV: (a) Given the following relational database schema: R= AB S= BC 2 2 2 21 3 3 Provide the result of these relational algebra expressions: Rx S, Re S, RS, RoS, Rx S, RUs The last one may show some incompatibility. Use the Rename operator p to find the solution. (b) Given the following relational database schema: R= ABC 701 2 3 1 S= BC|D 019 4 8 3 3 6. 1 3 Provide the result of these relational algebra expressions (Show your work): R-S, Rx S, RUS, ROS, R S, RES, RDS

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