Computers and Technology, 20.04.2021 19:40 valdezavery9018
¿Cuál es una clave principal?
a. Una clave principal identifica exclusivamente cada registro almacenado en la tabla
b. Una clave principal no permite duplicar registros en una tabla
c. A y B son correctas
d. A y B son incorrectas
Answers: 2
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When you mouse over and click to add a search term this(these) boolean operator(s) is(are) not implied. (select all that apply)?
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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)?
Answers: 1
¿Cuál es una clave principal?
a. Una clave principal identifica exclusivamente cada registro almac...
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