What format are answers?

Rows separated by `;`, columns by `|`; empty sets show “no result”.

What level is it for?

Anyone who knows basic SELECT; it moves from JOIN to window functions.

Where is progress stored?

Only in local localStorage, never uploaded; full backup/restore is available.

LEARNING GAME

Advanced SQL: 1000 Gamified JOIN and Subquery Cards

Turn advanced SQL into level cards: read the query, predict the result, then reveal; 20 cards per level. It covers multi-table JOINs, grouped filtering, IN/EXISTS subqueries, CASE and window functions.

0Due today

0New cards

0Day streak

0Lv.1 · 0/100

Progress is stored locally in localStorage and is lost if you clear storage. Reviews use 1/3/7/14/30/60/120-day intervals.