https://sqlai.dev/ https://sqlai.dev/docs/ https://sqlai.dev/test-sql-without-a-database/ https://sqlai.dev/run-sql-online-sqlite/ https://sqlai.dev/run-sql-online-duckdb/ https://sqlai.dev/validate-sql-query/ https://sqlai.dev/sql-error-no-such-column/ https://sqlai.dev/sql-syntax-error-near/ https://sqlai.dev/compare-two-sql-queries/ https://sqlai.dev/mcp-sql-verification/