Abstract
Given a set of objects, a skyline query finds the objects that are not dominated by another object. A skyline query helps us to filter unnecessary information efficiently and gives us clues for various decision making tasks. On the other hand, we usually have to hide individual record's values even though there is no ID information in the table in privacy aware environments. In such situation, we cannot use conventional skyline queries. To handle the privacy problem, we considered a skyline query for sets of objects in a database. In which we do not disclose individual record's values. Let s be the number of objects in each set and n be the number of objects in the database. There are
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