SQLFluff is a SQL formatter that is implemented in Python. You can use this app to format one-off, adhoc sql that might not be worth saving to a file. Or you can use it to see what SQLFluff thinks of your queries. It's up to you!
You can check out the source code for this application on GitHub (click).
Paste your SQL and select your dialect. Hit that button and find your fixed SQL with the associated linter errors. Enjoy, friends 🌝.
SQLFluff is maintained by a group of talented attractive and
selfless people who are all driven by a common disdain for poorly
formatted SQL. If you like fluff's treatment of your queries, feel
encouraged to check out our group on
GitHub!
This app runs on SQLFluff version 0.9.3, and applies all rules in that version. Here is a list of them:
| Rule | Description |
|---|---|
| L001 | Unnecessary trailing whitespace. |
| L002 | Mixed Tabs and Spaces in single whitespace. |
| L003 | Indentation not consistent with previous lines. |
| L004 | Incorrect indentation type. |
| L005 | Commas should not have whitespace directly before them. |
| L006 | Operators should be surrounded by a single whitespace. |
| L007 | Operators should follow a standard for being before/after newlines. |
| L008 | Commas should be followed by a single whitespace unless followed by a comment. |
| L009 | Files must end with a single trailing newline. |
| L010 | Inconsistent capitalisation of keywords. |
| L011 | Implicit/explicit aliasing of table. |
| L012 | Implicit/explicit aliasing of columns. |
| L013 | Column expression without alias. Use explicit `AS` clause. |
| L014 | Inconsistent capitalisation of unquoted identifiers. |
| L015 | 'DISTINCT' used with parentheses. |
| L016 | Line is too long |
| L017 | Function name not immediately followed by bracket. |
| L018 | 'WITH' clause closing bracket should be aligned with 'WITH' keyword. |
| L019 | Leading/Trailing comma enforcement. |
| L020 | Table aliases should be unique within each clause. |
| L021 | Ambiguous use of 'DISTINCT' in select statement with 'GROUP BY'. |
| L022 | Blank line expected but not found after CTE closing bracket. |
| L023 | Single whitespace expected after 'AS' in 'WITH' clause. |
| L024 | Single whitespace expected after 'USING' in 'JOIN' clause. |
| L025 | Tables should not be aliased if that alias is not used. |
| L026 | References cannot reference objects not present in 'FROM' clause. |
| L027 | References should be qualified if select has more than one referenced table/view. |
| L028 | References should be consistent in statements with a single table. |
| L029 | Keywords should not be used as identifiers. |
| L030 | Inconsistent capitalisation of function names. |
| L031 | Avoid table aliases in from clauses and join conditions. |
| L032 | Prefer specifying join keys instead of using 'USING'. |
| L033 | 'UNION [DISTINCT|ALL]' is preferred over just 'UNION'. |
| L034 | Select wildcards then simple targets before calculations and aggregates. |
| L035 | Do not specify 'else null' in a case when statement (redundant). |
| L036 | Select targets should be on a new line unless there is only one select target. |
| L037 | Ambiguous ordering directions for columns in order by clause. |
| L038 | Trailing commas within select clause. |
| L039 | Unnecessary whitespace found. |
| L040 | Inconsistent capitalisation of boolean/null literal. |
| L041 | 'SELECT' modifiers (e.g. 'DISTINCT') must be on the same line as 'SELECT'. |
| L042 | Join/From clauses should not contain subqueries. Use CTEs instead. |
| L043 | Unnecessary 'CASE' statement. |
| L044 | Query produces an unknown number of result columns. |
| L045 | Query defines a CTE (common-table expression) but does not use it. |
| L046 | Jinja tags should have a single whitespace on either side. |
| L047 | Use consistent syntax to express "count number of rows". |
| L048 | Quoted literals should be surrounded by a single whitespace. |
| L049 | Comparisons with NULL should use "IS" or "IS NOT". |
| L050 | Files must not begin with newlines or whitespace. |
| L051 | 'INNER JOIN' must be fully qualified. |
| L052 | Statements must end with a semi-colon. |
| L053 | Top-level statements should not be wrapped in brackets. |
| L054 | Inconsistent column references in 'GROUP BY/ORDER BY' clauses. |
| L055 | Use 'LEFT JOIN' instead of 'RIGHT JOIN'. |
| L056 | 'SP_' prefix should not be used for user-defined stored procedures in T-SQL. |
| L057 | Do not use special characters in identifiers. |
| L058 | Nested 'CASE' statement in 'ELSE' clause could be flattened. |
| L059 | Unnecessary quoted identifier. |
| L060 | Use 'COALESCE' instead of 'IFNULL' or 'NVL'. |
| L061 | Use '!=' instead of '<>' for "not equal to" comparisons. |