Common Data for Questions 50 and 51: Consider the following relations $A$, $B$ and $C$: How many tuples does the result of the following relational algebra expression contain? Assume that the schema of $A \cup B$ is the same as that of $A$. $(A \cup B) \bowtie_{A.\text{Id} > 40 \lor C.\text{Id} < 15} C$

Common Data for Questions 50 and 51: Consider the following relations A, B and C: How many tuples does the result of the following relational algebra expression contain? Assume that the schema of A B is the same as that of A. (A B) A.Id > 40 C.Id < 15 C

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