SQLフォーマッター
New複雑なSQLクエリのキーワードを自動で大文字化し整列するツール。
サポートされるフォーマット機能:
- SELECT, FROM, WHERE, JOIN 句の適切なインデント
- 主要キーワードの大文字自動変換
- カラムリストのカンマ後の自動改行
- AND/OR 条件のインデント
- 本番クエリ用の一行圧縮
このツールについて
SQL (Structured Query Language) is the standard language for querying and manipulating relational databases (PostgreSQL, MySQL, SQLite, SQL Server, Oracle). Production SQL—especially queries generated by ORMs or copied from monitoring tools—is often written as a single long line with no indentation. A SQL formatter applies consistent indentation, capitalizes keywords (SELECT, FROM, WHERE, JOIN), and aligns clauses so the logical structure is immediately visible. Formatted SQL is easier to read, review, and debug. This tool formats SQL in your browser—no server upload required.
実践エンジニアリングガイド
SQLフォーマット規則、AST構文解析、およびクエリ可読性の実務的価値
SQLパーサーの内部構文木（AST）、予約語大文字化ルール、CTEによる可読性向上、DBAレビューの効率化、およびCI/CDでの自動SQLリンティングを解説します。
使い方
- 1Paste your SQL query into the input field.
- 2Click "Format" — the query is re-indented with uppercase keywords and clean clause alignment.
- 3Use "Minify" to collapse the query to a single line.
- 4Click "Copy" to copy the formatted result to your clipboard.
よくある質問 (FAQ)
- Does formatting change what the query does?
- No. SQL formatting only changes whitespace and letter casing for keywords. The query's logic, performance, and result are identical before and after formatting.
- Why are SQL keywords written in uppercase?
- Uppercase keywords (SELECT, FROM, WHERE) is a long-standing convention that visually separates language keywords from user-defined identifiers (table and column names). Most SQL is case-insensitive for keywords, so it is a style choice, not a requirement.
- Does this tool support all SQL dialects?
- The formatter handles standard ANSI SQL and common features from PostgreSQL, MySQL, and SQL Server. Highly vendor-specific syntax—like PostgreSQL dollar-quoting or SQL Server square-bracket identifiers—may not format perfectly.
- What should I do before running a formatted query in production?
- Always verify the formatted output matches the original logic—particularly check operator precedence in WHERE clauses and JOIN conditions. Formatting tools are not query validators; use EXPLAIN or your database's query planner to analyze performance.