SQL Checker (Oracle)
Paste SQL to check for Oracle-incompatible syntax (LIMIT, TOP, ISNULL, backticks), plus quick sanity checks like unbalanced quotes/parentheses. Fast, offline linting.
How to use
Use this Oracle SQL checker in seconds:
- Paste your SQL into the input box.
- Optionally enable Strict mode for tougher checks (example:
SELECT 1withoutFROM dual). - Click Check Oracle SQL.
- Read the status and suggested Oracle rewrites, then copy the report if needed.
FAQ
Does this tool fully validate Oracle SQL syntax?
No. It’s a lightweight checker for common Oracle-incompatible patterns and basic structural problems (quotes, comments, parentheses).
Why does it flag LIMIT or TOP?
LIMIT (MySQL/PostgreSQL) and TOP (SQL Server) aren’t Oracle syntax; Oracle typically uses FETCH FIRST n ROWS ONLY or ROWNUM.
Oracle says “missing FROM” — what should I do?
Oracle usually requires a FROM; for literal selects use FROM dual (example: SELECT 1 FROM dual).
Why is “FROM table AS t” flagged?
Oracle doesn’t allow AS for table aliases. Use FROM table t (drop AS).
How should I write null-handling in Oracle?
Use NVL(expr, replacement) or COALESCE(...) instead of ISNULL()/IFNULL().
Is my SQL uploaded anywhere?
No network calls are made by the tool’s JavaScript; it runs in-page.
Can it check PL/SQL blocks too?
It can still detect basic quote/comment/parenthesis issues, but it won’t deeply validate PL/SQL syntax.
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