MeritKeep

Subqueries

Scalar, row and table subqueries, and where each is legal.

core~1.5hWe mark it against a checklist you can read first
The barWhat counts as knowing this

Use a subquery in the right position to compute an intermediate result

That sentence is the bar. It only counts once your work shows you can do it. Reading about it does not.
Prove itA check for this one skill

Up to 1 question on this skill alone, marked against the bar beside this. It stops as soon as the answer is clear. No account, and your answers are not kept.

01 · Prerequisites

You'll need these first

03 · What comes next

What it unlocks

Start on SQL & Data Analysis

Every skill above, ordered by what depends on what, with the projects above that as the evidence you actually did it. We work out where you already are first, so the path skips what you can do.

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