Cosette: An Automated SQL Solver
Cosette is an automated prover for checking equivalences of SQL queries. It formalizes a substantial fragment of SQL in the Coq Proof Assistant and the Rosette symbolic virtual machine. It returns either a formal proof of equivalance or a counterexample for a pair of given queries. Checking SQL Equivalences in Cosette You can try the Cosette demo online, using Cosette Web API or download its sourc
HoTTSQL: Proving Query Rewrites with Univalent SQL Semantics
SQL is the lingua franca for retrieving structured data. Existing semantics for SQL, however, either do not model crucial features of the language (e.g., relational algebra lacks bag semantics, correlated subqueries, and aggregation), or make it hard to formally reason about SQL query rewrites (e.g., the SQL standard’s English is too informal). This post focuses on the ways that HoTT concepts (e.g
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