DBI202Xuất hiện trong 2 đề thi
Select the most correct answer
Các lựa chọn
AAn index is not a data structure used to speed access to tuples of a relation, given values of one or more attributes.
BThe key to index cannot be any attribute or set of attributes, and need not be the key to the relation.
CWe can think of the index as a binary search tree of (key, locations) pairs in which a key a is not associated with a set of locations of the tulips.
DAn index is a data structure used to speed access to tuples of a relation, given values of one or more attributes.