A survey on flexible/restricted skyline and their applicability

Skyline and Top-k are two of the most important method to extract information from dataset, but both come with their own drawbacks, that's why lately some new technics that try to mix the features of the two have been studied, in this survey three new operators are analyzed, F-Skyline, ORU/ORD and ${\epsilon}$-Skyline, after giving the main ideas behind those and their properties, they are compered on 3 fundamental features such as personalization, cardinality control and generalization to guide the user to choose the best one for any task.