Mutating database queries

Mutating database queries

A set of mutation operators for SQL queries that retrieve information from a database is developed and tested against a set of queries drawn from the NIST SQL Conformance Test Suite. The mutation operators cover a wide spectrum of SQL features, including the handling of null values. Additional experiments are performed to explore whether the cost of executing mutants can be reduced using select...

Database Preference Queries Revisited

The problem of preference elicitation and preference management has generated much interest in the database systems community in recent years. This interest stems from a rapidly growing class of untrained, lay users browsing extremely large databases accessible through the Internet. Typically these users do not have clear knowledge about the particular items that these databases contain, nor do...

Undeniable Database Queries

Intensional Answers to Database Queries

In addition to data, database systems store various on keys, integrity constraints, class hierarchies), are often kinds of information about their data. Examples are class hierarchies, to define the various data classes and their relationships; assumed as well, but little else is assumed. integrity constraints, to state required relationships among the Notable examples of this approach are the ...

Undeniable Replies for Database Queries