Qex: Symbolic SQL Query Explorer

Margus Veanes; Nikolai Tillmann; Peli de Halleux

Qex: Symbolic SQL Query Explorer

Margus Veanes ,
Nikolai Tillmann ,
Peli de Halleux

LPAR-16 | April 2010

Published by Springer Verlag

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We describe a technique and a tool called Qex for generating input tables and parameter values for a given parameterized SQL query. The evaluation semantics of an SQL query is translated into a specific background theory for a satisfiability modulo theories (SMT) solver as a set of equational axioms. Symbolic evaluation of a goal formula together with the background theory yields a model from which concrete tables and values are extracted. We use the SMT solver Z3 in the concrete implementation of Qex and provide an evaluation of its performance.