RecallWeave · SQL explorer
Follow the rows.
One small dataset. Twelve ways to question it. Predict what a query returns, then follow the NULLs, counts, and joins into its result.
Loading prepared examples…
Choose an example
Prepared query
Read-only SQLThese saved results are executed with SQLite when the explorer is built. Controls choose prepared queries. Download the practice SQL to try your own edits in SQLite.
Predict, then inspect
Count the rows returned by SELECT. An aggregate such as COUNT(*) can put a large count inside just one result row.
Choose a prediction or reveal the result.
What the query returns
Keep exploring
The 12-question course follows RecallWeave's local deck format.
The practice file includes the fictional tables and every prepared query.
Your predictions stay on this page and reset when you reopen it. Downloads happen only when requested. Original RecallWeave teaching material; SQLite-specific ordering is stated where used. External documentation links open only when you choose them.