SQL Formatter

This is a lightweight, regex-based formatter rather than a full SQL parser. It first collapses every run of whitespace in your query down to single spaces, then inserts a line break before each keyword in a fixed list of about 25 common ones — SELECT, FROM, WHERE, the JOIN variants, GROUP BY, ORDER BY, HAVING, LIMIT, INSERT INTO, VALUES, UPDATE, SET, DELETE FROM, CREATE/ALTER/DROP TABLE, UNION, AND, and OR. Those keywords are also upper-cased. Finally, it adds a newline plus two spaces after every comma. Because it works by pattern matching and not by parsing the grammar, it has no awareness of nesting: every keyword line starts at column zero, so subqueries are not indented more deeply than the outer query. Keywords outside its list — DISTINCT, AS, WITH and CTEs, CASE/WHEN, BETWEEN, IN, LIKE, CROSS JOIN, FULL JOIN — are left inline. The comma rule is also context-blind, so it splits function arguments like COALESCE(a, b) and multi-row VALUES tuples the same way it splits a SELECT column list. It is meant for a quick readability pass on flat queries, not for pretty-printing complex statements to a style guide.