Learn How to Write a Mini SQL Parser in Python (Step by Step)

A comprehensive guide to building a SQL parser in Python using the ply library. Covers the two core stages of parsing: lexical analysis (tokenization) and syntactic analysis (AST construction). Includes step-by-step implementation of a lexer and parser that can handle basic SELECT statements with FROM and WHERE clauses. Demonstrates how to convert SQL text into structured Abstract Syntax Trees and discusses limitations and advanced directions for production-ready parsers.