Enhancing SQL with Set-Comparison Operators

摘要

Many queries, such as those involve words like "every", "only", "some", "at least", etc., are very difficult to formulate in SQL. In this paper, we analyze the problems and propose a solution by enhancing SQL with set-comparison operators. These operators would allow users to express such difficult to formulate queries in a simple and natural manner, greatly enhancing the user-friendliness of SQL.