  We present sensitivity analysis for results of query executions in a
relational model of data extended by ordinal ranks. The underlying model of
data results from the ordinary Codd's model of data in which we consider
ordinal ranks of tuples in data tables expressing degrees to which tuples match
queries. In this setting, we show that ranks assigned to tuples are insensitive
to small changes, i.e., small changes in the input data do not yield large
changes in the results of queries.
