Question: Problem 1. (30 points) Consider the following table (relation) R A B C 1 1 1 1 NULL NULL 3 1 2 1 NULL 3

Problem 1. (30 points) Consider the following table (relation) R A

B C 1 1 1 1 NULL NULL 3 1 2 1

Problem 1. (30 points) Consider the following table (relation) R A B C 1 1 1 1 NULL NULL 3 1 2 1 NULL 3 Compute the answers to the following SQL queries: (1) SELECT A, B FROM R WHERE A B (2) SELECT FROM R WHERE B A AND B C (3) SELECT FROM R WHERE B NULL (4) SELECT FROM R

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