CTEs & Recursive Queries — WITH Clause / Hierarchies / Graph Walks
SQL skills for the Data Engineer career path. Filter, model, and reason about the real data this role works with every day.
SQL skills for the Data Engineer
Building on Window Functions — ROW_NUMBER / RANK / LAG / LEAD / SUM OVER, this lesson focuses on the practical SQL toolkit a working Data Engineer reaches for on the job.
Try the first query
SELECT example, value
FROM sql_dataset
WHERE priority = '1'
AND career = 'Data Engineer';
▸ preview · Sprint-2 will replace this with a live runner
PIVOT / UNPIVOT & Conditional Aggregates for Reporting
Once this topic clicks, the recommended next step keeps the learning streak going on adjacent skills in the same career path.
continue path →Sprint-1 stub
This is the Sprint-1 stub for ai.careerplane.data-analytics.data-engineer.sql.ctes-subqueries.
The fully-generated topic page (sandbox + quiz + AI hints + interactive
tooling) lands in Sprint-2 at
(per arch/memo.md → D-2026-04-22-13). The
//go:embed all:static directive auto-serves
it on the next container rebuild — no server-code change needed.