Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Transcribed Image Text:(2) Consider the following fragment of a positional index with the format: word: document: <position, position, ...>; document: < position, ...>.. Gates: 1: <3>; 2: <6>; 3: <2,17>; 4: <1>; IBM: 4: <3>; 7: <14>; Microsoft: 1: <1>; 2: <1,21>; 3: <3>; 5: <16,22,51>; The /k operator, word1 /k word2 finds occurrences of word1 within k words of word2 (on either side), where k is a positive integer argument. Thus k = 1 demands that word1 be adjacent to word2. Describe the set of documents that satisfy the query Gates /2 Microsoft. O {1, 2} しろまる {1,3} しろまる {2, 3} しろまる {4, 5}
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