CURRICULUM

SQL Programming: Four Difficulties, 4000 Levels

SQL has four difficulties with 1000 levels each and ten questions per level; predict the output first, then add speed. SQL levels ask what a query returns, not just whether it runs; you read joins, grouping, filters and subqueries and predict the result table.

SQL 编程基础闯关SQL Basics1000 关SQL 编程进阶闯关SQL Intermediate1000 关SQL 编程高阶闯关SQL Advanced1000 关SQL 编程挑战闯关SQL Challenge1000 关

How it works

  1. Start at the basic difficulty.
  2. Ten questions per level; clear one to unlock the next.
  3. Review at 1/3/7/14/30 days.

FAQ

Which difficulty?

Start at basic and move up when accuracy stays above 80%.

How many levels each?

1000.