SQL Case Converter - UPPER, lower, or Proper Case

Change the case of SQL keywords in your queries instantly. Convert to UPPERCASE, lowercase, or Proper Case to match your team's coding standards and improve readability.

SQL Case Converter

Convert SQL keywords to UPPERCASE, lowercase, or Proper Case.

Case Style:

SQL Query

Result

Converted SQL will appear here...

Keywords Affected

SELECTFROMWHEREJOININNERLEFTRIGHTFULLOUTERONANDORNOTINBETWEENLIKEISNULLORDERBY+43 more

How It Works

This SQL case converter transforms the capitalization of SQL keywords in your queries between UPPERCASE, lowercase, and Proper Case formats with a single click.

The conversion process:

Keyword detection: The tool identifies SQL reserved words (SELECT, FROM, WHERE, JOIN, etc.) while preserving table names, column names, and string literals.
Case transformation: Based on your selection, keywords are converted to all caps, all lowercase, or title case (first letter capitalized).
Preservation of context: String values, comments, identifiers, and user-defined names remain unchanged - only SQL keywords are affected.
Instant output: The transformed query appears immediately, ready to copy and use.

Consistent keyword casing improves code readability and helps teams maintain uniform SQL style across projects and organizations.

When You'd Actually Use This

Enforcing Team Style Guides

Convert queries to match your organization's SQL coding standards before committing to version control.

Preparing Code Examples

Format SQL snippets for documentation, presentations, or Stack Overflow posts with consistent keyword casing.

Legacy Code Modernization

Update old queries with inconsistent casing to match modern team conventions during refactoring.

Learning SQL

Beginners often find UPPERCASE keywords easier to distinguish from table and column names.

Cross-Team Collaboration

Standardize queries when merging code from teams with different casing preferences.

Automated Code Formatting

Pre-process SQL before running through formatters that expect specific keyword casing.

What to Know Before Using

SQL is case-insensitive for keywords

Databases treat SELECT, select, and Select identically. Case conversion is purely for human readability, not functional differences.

String literals are preserved

Text inside quotes won't be changed. 'Hello World' stays 'Hello World' regardless of keyword case setting.

Identifiers may be affected on some systems

Table and column names are usually preserved, but case-sensitive databases (like PostgreSQL with quoted identifiers) may behave differently.

Comments remain unchanged

SQL comments (-- and /* */) keep their original casing to preserve any intentional formatting or emphasis.

Function names follow keyword rules

Built-in functions (COUNT, SUM, DATE_ADD) are treated as keywords and will be converted along with SELECT, FROM, etc.

Common Questions

Does keyword case affect query performance?

No. The database query optimizer treats all case variations identically. Performance depends on query structure, indexes, and data distribution - not capitalization.

What's the most common SQL keyword casing style?

UPPERCASE is traditional and widely used in enterprise environments. It makes keywords visually distinct. Many modern teams prefer lowercase for faster typing. Both are correct.

Should table and column names match keyword case?

Most style guides recommend lowercase for identifiers (users, order_date) with uppercase keywords (SELECT * FROM users). This creates clear visual distinction.

Can I convert only specific keywords?

This tool converts all keywords uniformly. For selective changes, use a text editor with regex find/replace to target specific keywords.

What about database-specific functions?

Vendor-specific functions (NVL, ISNULL, COALESCE) are treated as keywords and will be converted. The underlying function behavior remains unchanged.

How do I maintain consistent case across my team?

Document your style choice in a coding standards guide. Use linters or formatters (like sqlfmt) in CI/CD to enforce consistency automatically.

Does this work with stored procedures?

Yes, but only for SQL keywords inside the procedure body. Procedural elements (variable declarations, flow control) may need separate formatting.

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SQL Case Converter - UPPER, lower, or Proper Case