01
Beginner
3 related exercises
SELECT, FROM and WHERE
Query a table and filter the relevant rows.
SQL lessons
SQL lessons
A progressive learning path using simplified finance and business data: queries, joins, grouping, aggregations and overdue balance analysis.
Recommended learning path
QuerySELECT · WHERE
JoinJOIN · LEFT JOIN
AnalyzeGROUP BY · HAVING
02
Beginner
1 related exercises
ORDER BY and LIMIT
Sort results to produce a useful output.
03
Intermediate
4 related exercises
JOIN: connect multiple tables
Connect tables through primary and foreign keys.
04
Intermediate
6 related exercises
GROUP BY and aggregate functions
Calculate metrics from multiple rows.
05
Advanced
3 related exercises
LEFT JOIN, NULL and COALESCE
Identify missing or incomplete data.
06
Advanced
5 related exercises
HAVING, subqueries and finance calculations
Filter calculated metrics and build analytical queries.