Explain the distinction between condition-defined and user-defined constraints. Which of these constraints can the system check automatically? Explain your answer.
Answer to relevant QuestionsExplain the distinction between disjoint and overlapping constraints.Reconsider the situation described for Exercise 2.26 under the assumption that one bank is in the United States and the other is in Canada. As before, the banks use the schema of Figure, except that the Canadian bank uses ...The outer-join operations extend the natural-join operation so that tuples from the participating relations are not lost in the result of the join. Describe how the theta join operation can be extended so that tuples from ...Repeat Exercise 3.5 using the tuple relational calculus and the domain relational calculus.Let R = (A, B, C), and let r1 and r2 both be relations on schema R. Give an expression in SQL that is equivalent to each of the following queries. a. r1 ∪ r2 b. r1 ∩ r2 c. r1 − r2 d. II AB(r1) 1 ...
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