14 citations · 56 across the 15 of their papers we have counts for
4 papers · 1 filter
Invariance to ordinal transformations in rank-aware databases
Vilem Vychodil
We study influence of ordinal transformations on results of queries in rank-aware databases which derive their operations with ranked relations from totally ordered structures of s…
Relational Division in Rank-Aware Databases
Ondrej Vaverka, Vilem Vychodil
We present a survey of existing approaches to relational division in rank-aware databases, discuss issues of the present approaches, and outline generalizations of several types of…
Monoidal functional dependencies
Vilem Vychodil
We present a complete logic for reasoning with functional dependencies (FDs) with semantics defined over classes of commutative integral partially ordered monoids and complete resi…
Sensitivity Analysis for Declarative Relational Query Languages with Ordinal Ranks
Radim Belohlavek, Lucie Urbanova, Vilem Vychodil
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…