Amed is utilizing a feature that will use two tables. The first table contains a primary key matched to a foreign key in the second table. The query results will include all entries from the first table. Which feature is he using? A. left outer join
B. right outer join
C. self join
D. inner join

(edge 2021)

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Suppose there is a relation r(a, b, c) with a b+-tree index with search keys (a, b).1. what is the worst-case cost of finding records satisfying 10 < a < 50 using this index, in terms of the number of records n1, retrieved and the height h of the tree? 2. what is the worst-case cost of finding records satisfying 10 < a < 50 and 5 < b < 10 using this index, in terms of the number of records n2 that satisfy this selection, as well as n1 and h defined above? 3. under what conditions on n1 and n2, would the index be an efficient way of finding records satisfying the condition from part (2)?

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