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Query optimizers of current relational database systems tivated by their importance in query optimization and their sensitivity to error propagation. 268 We are aware of no work in the area of error propagation in the context of database query optimization. There is extensive literature on deriving good estimates for the parameters of the result of database operations, which has been surveyeddoi:10.1145/119995.115835 fatcat:vlvrelr2fjd6xn2yj4zpscr4o4