International Journal of Computer and Information Technology (IJCIT)
In this paper, the authors discussed the difficulties in expressing queries that involve the concepts of comparing sets of tuples in SQL. They proposed to incorporate set-comparison operators into SQL and showed that with these operators; previously difficult queries can be easily formulated. Queries that involve words like \"Every\", \"Only\", etc., are generally difficult to formulate in SQL. In this paper, they analyze the problems and propose a set of set-comparison operators to enhance the usability of SQL. These operators allow users to formulate conventionally difficult queries in an easier way, greatly enhancing the user-friendliness of SQL.