This paper is devoted to evaluation of mutation operators of SQL queries that retrieve information from a database. The operators mimic various faults of the queries that are syntactically correct but produce results unintended by the developers. A case study applies the SQL mutation operators to typical queries commonly used in programs cooperating with a real database implemented in an insurance company. The experimental results of the mutation testing and performance measures are provided. Usability of operators was validated comparing distribution of generated mutants, ability to detect mutants by tests and execution times of mutants.
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