Format SQL for Review Without Changing Query Behavior

SQL formatting is valuable because it makes the shape of a query visible: selected columns, joined tables, filters, grouping, and ordering. It becomes risky when formatting is mixed with cleanup that changes logic. A production query should be made readable without moving predicates, changing parentheses, or rewriting literals under the assumption that whitespace is the only thing changing. ## Keep the original beside the formatted query Format a copy first. Put major clauses on separate lines and give long select lists one expression per line. Indent join conditions and nested queries so a reviewer can see scope. This makes it easier to spot a missing tenant filter or an unexpected join without requiring a new query parser in every review. The CalcSnippets SQL Formatter is a lightweight browser helper for improving readability. It does not understand every SQL dialect or prove semantic equivalence. Preserve comments, parameters, quoted strings, and database-specific syntax, then run the result through the real database tooling before using it in an application. ## Protect joins and boolean conditions Moving a condition from an outer join's `ON` clause to `WHERE` can turn the result into an inner join. Removing parentheses around mixed `AND` and `OR` expressions can change which rows qualify. A formatting review should explicitly compare these areas. For a write query, start with the equivalent select and inspect the candidate rows before an update or delete. ## Validate after formatting Run the original and formatted query with safe representative data, compare row count and sample results, and inspect the execution plan when performance matters. Separate whitespace changes from behavioral changes in source control. Readable SQL is a reliability feature because it gives the next person a real chance to notice the assumption that would otherwise remain hidden in one long line.