beginner
SQL Foundations for Engineers
Write reliable SELECT/INSERT/UPDATE flows with joins, constraints, and readable structure.
¥48,000 JPY
Program signals
6
Seasons shipping refreshed lab sets
1,200+
Documented lab minutes across cohorts
91%
Recent exit surveys: would suggest to a teammate
<72h
Typical mentor comment turnaround on core assignments
14
Organizations represented in last two intakes
Signal, not slogans
12 live outlines
mapped to database engineering habits hiring managers can recognize.
Trusted by internal tooling squads at logistics, analytics, and fintech teams — satisfaction mix from exit surveys, mentor check-ins, and partner feedback (not a single third-party score).
Inclusions you can point to in an interview
Annotated migrations
Pull-request style feedback on DDL and rollback notes — not autograded multiple guess.
Scenario labs
Replication lag, plan shifts, and backup drills on disposable clusters you cannot break.
Cohort rhythm
Live reviews alternate with async deep work so Tokyo and Sapporo time zones stay workable.
Readable artifacts
Every track ends with a repo slice and short memo you are allowed to sanitize for employers.
Featured outlines
View full catalog → 
intermediate
Indexing Internals Workshop
B-tree and hash trade-offs, partial indexes, and plan reading for real workloads.
¥62,000 JPY
intermediate
Transaction Isolation in Practice
Serializable vs read committed, phantom reads, and designing safer application transactions.
¥78,000 JPY
beginner
Replication Concepts Boot Lab
Leader/follower, lag, read replicas, and failover vocabulary without vendor hype.
¥36,000 JPY
01 — The flow (compressed)
- Step 1
Map
You bring a repo or sample domain; we agree on scope and risk boundaries.
- Step 2
Build
Weekly labs with explicit acceptance notes — no mystery rubrics.
- Step 3
Defend
Short review call where you explain trade-offs as if to a staff engineer.
From our cohorts
“The Transaction Isolation in Practice anomaly labs mirrored a double-post bug we had. Idempotency worksheet is now pinned in Notion.”
Backup drill PDF felt overkill until we timed a restore. Still want clearer audio on one lecture.
“Indexing Internals Workshop — partial index module paid for itself. I sent the plan diff template to platform guild.”
Warehouse intro stopped our event-name bike-shedding.
Syllabus drops & office-hour calendar
Monthly notes on new labs — no purchase required. Unsubscribe anytime; we do not sell addresses.
Prefer human context? Schedule a call.