Databases
Schema, then query.
the shape of this subject
SQL and relational reasoning reward students who model the domain first. Brainback pushes you to write the ER diagram before you write a join.
Because databases rewards the students who do the reps — and punishes the ones who outsource them.
- discipline
- STEM
- parent subject
- Computer science
- typical weekly load
- 3-6 problem sets · 3-5 hours · 1-2 recall sessions
- covered on plan
- all plans (free forever)
Every databases concept Brainback covers.
Add Databases as a Learn subject and every problem in these areas routes to the Socratic tutor — attempt-first, hint-laddered, output-guarded.
What one turn in databases actually looks like.
Attempt → correction → guiding question. No answer. Ever. Verbatim from a beta session.
I joined orders to customers on customer_id, then grouped by month…
What's the primary key? What's the foreign key?
no answer · one guiding question · your next move
How real attempts start. How Brainback nudges.
- I joined orders to customers on customer_id, then grouped by month…
- What's the primary key? What's the foreign key?
the anti-pattern
What databases looks like when the AI does the thinking.
Answer machines make databases look like a solved problem. It isn't. The exam room reveals whose reasoning was built and whose was rented.
- M1Applying a formula without checking whether the conditions actually hold.
- M2Skipping the sanity check — 'does the sign / magnitude make sense?'
- M3Memorizing steps instead of reasoning about why they're legal.
- M4Reading past the setup and diving straight into computation.
the recall card
What a spaced-repetition card looks like in databases.
Every wrong attempt and low-scored explain-back becomes a card. SM-2 schedules them — the tricky ones come back tomorrow, the solid ones drift out to next week, then next month.
Recall the core concept in your own words. Then apply it to a fresh example under 2 minutes.
Related subjects.
The subject where the shortcut has always been most expensive.
Limits, rates, and shapes of change — earned, not delivered.
Where symbolic manipulation becomes second nature — or doesn't.
See the diagram. Not just look at it.
Unit circle, but also unit intuition.
Vectors are directions, not numbers.
databases — ready when you are
Start your first databases session.
Attempt-first. Never the answer. Add it as a Learn subject in 30 seconds.