PR0L1NE

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Write SQL and watch it run on a real PostgreSQL in your browser, one clause at a time, in the order Postgres runs them: the table at each step, every row kept or dropped and why, joins drawn as lines between rows, groups folding into rows, subqueries, window functions and recursive queries. Sample databases to start from, or your own tables. Free, no sign-up, and it runs in your own browser.

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