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This skill provides deep technical insights into PostgreSQL internals by referencing the core grammar files (gram.y) and parser implementation (parse_utilcmd.c). It is designed to help developers understand exactly how PostgreSQL interprets SQL constructs, making it an essential resource for building database migration tools, custom parsers, or complex schema management utilities. By mapping SQL statements to their underlying Bison/Yacc rules, it ensures high-fidelity DDL generation and accurate parsing of even the most obscure PostgreSQL extensions.