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SQL Checker Online

Check SQL quickly for common mistakes before you run it. This is a client-side heuristic checker (not a full DB parser): it spots frequent syntax issues and risky patterns, and gives you a compact report with line/column hints.

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

How to use

Paste your SQL, pick a dialect, and run the checker.

  1. Paste one or more SQL statements into the input box.
  2. Choose a dialect (Generic / MySQL / PostgreSQL / SQL Server).
  3. Click Check SQL to see errors and warnings.
  4. Optionally enable Require semicolon at end if you need strict statement termination.
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Secondary intents covered: Find unclosed quotes or comment blocks in pasted SQL, Detect unbalanced parentheses and obvious punctuation mistakes, Spot risky UPDATE/DELETE queries missing a WHERE clause, Validate basic structure (UPDATE needs SET, INSERT needs VALUES/SELECT), Split and check multiple SQL statements at once, Get line/column pointers to quickly locate errors, Check for simple dialect mismatches (LIMIT vs TOP, backticks), Copy a compact report to paste into tickets or PR reviews

FAQ

Is this a full SQL parser?

No. It runs fast heuristic checks in your browser and can’t guarantee the SQL will execute on your database.

Does my SQL get uploaded to a server?

No. The checker runs client-side and does not send your query over the network.

Why does it warn about UPDATE/DELETE without WHERE?

Those statements can affect many rows if you forget the filter. It’s a safety warning, not always an error.

Can it handle multiple statements?

Yes. It splits statements on semicolons outside strings/comments and checks each one.

How accurate are the line/column pointers?

They’re approximate and based on simple pattern matches, but usually close enough to find the issue quickly.

Why do dialect warnings appear (LIMIT vs TOP, backticks)?

Different databases use different syntax. Dialect warnings help catch portability issues early.

What should I do if the tool says “no issues” but my DB errors?

Run the query on your target database and check the exact dialect/version and schema; this tool can’t validate tables, columns, or full grammar.