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SQL Checker (Oracle)

Paste your SQL and run a quick Oracle-focused check. It flags common non-Oracle syntax (like LIMIT, TOP, ISNULL, backticks) and basic structural problems (unclosed quotes/comments, unbalanced parentheses). It’s a lightweight linter—not a full Oracle parser.

Category: Data · URL: /tools/sql-checker-oracle.html
Privacy: runs locally in your browser. No uploads, no tracking scripts.

How to use

Use this Oracle SQL checker in seconds:

  1. Paste your SQL into the input box.
  2. Optionally enable Strict mode for tougher checks (example: SELECT 1 without FROM dual).
  3. Click Check Oracle SQL.
  4. Read the status and suggested Oracle rewrites, then copy the report if needed.
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Secondary intents covered: Validate whether a query contains non-Oracle keywords or functions, Catch obvious SQL typos before running in Oracle (quotes, parentheses, comments), Get Oracle-friendly rewrite hints for LIMIT/TOP/ISNULL/GETDATE, Check if a SELECT is missing a FROM/DUAL pattern, Detect SQL Server/MySQL style bind variables (e.g., @id) and suggest Oracle binds (:id), Spot identifier quoting issues (backticks vs double quotes), Review scripts for multiple statements separated by semicolons, Quickly copy a compact report to share in reviews or tickets, Reset and rerun checks on mobile without heavy UI

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.