This SQL injection cheat sheet provides examples of useful syntax for performing various tasks during SQL injection attacks, including string concatenation, substring extraction, comments, database version querying, database contents listing, conditional errors, extracting data via visible error messages, batched queries, time delays, conditional time delays, and DNS lookups. The cheat sheet covers various database management systems, including Oracle, Microsoft, PostgreSQL, and MySQL, and provides examples of syntax for each system. The topics covered include: * String concatenation * Substring extraction * Comments * Database version querying * Database contents listing * Conditional errors * Extracting data via visible error messages * Batched queries * Time delays * Conditional time delays * DNS lookups The cheat sheet is a valuable resource for penetration testers and security professionals who need to perform SQL injection attacks as part of their work.