In order to strengthen its expressive power, many database researchers have introduced or proposed certain extensions to this model. Some of these extensions are important, while others add little expressive power but provide auxiliary features. Since the ER model is used so widely, it is ...
Inferring such data prop- erties is a sizable cost (e.g., [58] uses student t-test between every pair of columns). It is unclear if these properties can be maintained when data evolves. More importantly, imprecise data properties are less useful for QO (e.g., a soft functional ...