This is a learning outline. A complete worked tutorial has not been published for this topic yet.
01
Relate two tables
Write a join between sample orders and customers
Evidence: t017/m01/evidence
02
INNER and LEFT JOIN
Identify a one-to-many relationship that inflates totals
Evidence: t017/m02/evidence
03
Duplicates and missing rows
Calculate grouped revenue with the correct grain
Evidence: t017/m03/evidence
04
Validate totals
Reconcile the query against a hand-checked fixture
Evidence: t017/m04/evidence
03 / TRY IT
Apply the micro-course
Demonstrate the promised artifact
Change one supplied assumption or remove one required input for a checked two-table business report; identify the limitation rather than inventing success.
Independently explain and change one assumption in a checked two-table business report.
Keep your work
Reconcile the result count and explain why a join duplicates or omits rows.; The documented failure/uncertainty is visible, and no prohibited action or unsupported success claim occurs.; The learner predicts and verifies the change; AI output is not accepted without understanding.
Check your understanding
Reconcile the result count and explain why a join duplicates or omits rows.
Show one small example, the expected result and the reasoning behind it.
Record one limitation or edge case and a question to discuss with a mentor.
04 / LEARN WITH HELP
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