Click "Validate" to check your SQL
What is SQL Syntax Validator?
SQL (Structured Query Language) is the standard language for managing relational databases. This validator performs static analysis of your SQL queries to detect common syntax errors before you run them against a database. It checks for unclosed strings, mismatched parentheses, missing keywords, invalid statement structure, and dialect-specific issues for MySQL, PostgreSQL, and SQLite.
How to Use
- Select your SQL dialect (MySQL, PostgreSQL, or SQLite)
- Paste your SQL queries in the input area
- Click 'Validate' to check for syntax errors
- Review the results — errors are shown with line numbers and descriptions
Why Use This Tool?
Tips & Best Practices
- The validator checks syntax structure but cannot verify table or column names — those require a live database
- Use the dialect selector to get accurate reserved word warnings for your target database
- Statements without semicolons will generate warnings — this is optional in many clients but recommended for clarity
- UPDATE and DELETE without WHERE clauses generate warnings to help prevent accidental data loss
Frequently Asked Questions
What SQL dialects are supported?
The validator supports MySQL, PostgreSQL, and SQLite. Each dialect has its own set of reserved words and syntax rules. Select the appropriate dialect before validating your query to get accurate results.
What types of errors does the validator detect?
The validator checks for unclosed strings, unclosed parentheses, missing keywords (like FROM in SELECT, VALUES in INSERT), invalid statement structure, duplicate column aliases, and dialect-specific reserved word conflicts. It also warns about missing semicolons and other common issues.
Does the validator execute the SQL?
No. The validator only checks syntax structure — it does not execute the SQL or connect to any database. It performs static analysis of the query text to find potential syntax errors before you run the query against a real database.
How accurate is the validation?
The validator performs structural and lexical analysis, which catches most common syntax errors. However, it cannot validate table names, column names, or data types — those require a live database connection. Complex nested queries and stored procedures may have limited validation coverage.
Is my SQL data secure?
Yes. All validation happens entirely in your browser. Your SQL queries are never sent to any server, stored, or transmitted. You can safely validate queries containing sensitive table names or business logic.