SQL Optimizer Suggestions Online

SQL querySQL137bytes

High1

Medium3

Low1

highImplicit/comma join

Using comma-separated tables risks an accidental cartesian product. Use explicit JOIN ... ON ... .

mediumSELECT * detected

Select only the columns you need to reduce I/O and avoid breaking on schema changes.

mediumLeading-wildcard LIKE

LIKE '%term%' can't use a normal index. Consider full-text search or a trailing-only wildcard.

mediumFunction on a filtered column

Wrapping a column in a function (e.g. YEAR(col)=2024) prevents index use. Filter on a range instead (col >= '2024-01-01' AND col < '2025-01-01').

lowORDER BY without LIMIT

Sorting the full result set is expensive when you only need the top rows.

Tip: use samples, upload, copy, download, and send-to actions inside the workspace where available.

What is SQL Optimizer Suggestions?

SQL Optimizer Suggestions is a free, browser-based tool that helps you get the job done quickly. Static heuristics: missing indexes, SELECT *, cartesian joins. It's built for speed and privacy: Everything runs locally in your browser — your data is never uploaded to a server. No sign-up, no installs, and no daily limits.

How to use SQL Optimizer Suggestions

1Paste or drop your SQL into the workspace.
2Adjust the available options to suit your data.
3Copy or download the result — it never leaves your browser.

Features

Fast, focused, and easy to use
100% client-side — no upload, fully private
Free with no account, no watermark, and no daily limit
Works on large inputs, limited only by your device's memory
Load a sample, then copy, download, or share your result

Common uses

Drafting and checking queries without a database connection
Quick one-off data jobs without opening a heavy app
Preparing data before importing it elsewhere
Sharing a reproducible result with a teammate via a link

Frequently asked questions

How do I use SQL Optimizer Suggestions?: Paste or drop your data into the workspace, adjust the options to fit your data, then copy or download the result. Static heuristics: missing indexes, SELECT *, cartesian joins.
Is my data uploaded or stored anywhere?: No. Everything runs locally in your browser — your data is never uploaded to a server. Nothing is sent to a server, so it's safe to use with private or sensitive data.
Is SQL Optimizer Suggestions free?: Yes — it's completely free with no account, no sign-up, no watermark, and no daily usage limits.
What's the maximum file size?: There's no hard limit imposed by the tool. Because processing happens in your browser, the practical ceiling is your device's available memory — most everyday files work instantly.
Do I need to install anything?: No installs and no extensions — it runs entirely in your web browser and even works offline once the page has loaded.

What is SQL Optimizer Suggestions?

Frequently asked questions

How do I use SQL Optimizer Suggestions?

Paste or drop your data into the workspace, adjust the options to fit your data, then copy or download the result. Static heuristics: missing indexes, SELECT *, cartesian joins.

Is my data uploaded or stored anywhere?

No. Everything runs locally in your browser — your data is never uploaded to a server. Nothing is sent to a server, so it's safe to use with private or sensitive data.

Is SQL Optimizer Suggestions free?

Yes — it's completely free with no account, no sign-up, no watermark, and no daily usage limits.

What's the maximum file size?

There's no hard limit imposed by the tool. Because processing happens in your browser, the practical ceiling is your device's available memory — most everyday files work instantly.

Do I need to install anything?

No installs and no extensions — it runs entirely in your web browser and even works offline once the page has loaded.