Joins and row multiplication
Use joins and row multiplication to make decisions inspectable.
What you should be able to do
Independently: Join customers and orders and reconcile row counts and totals.
Suggested prerequisites
A short guide
Use joins and row multiplication to make decisions inspectable. Join customers and orders and reconcile row counts and totals. Read the indicated source section, identify its key concepts and conditions, and work through the example. Record inputs, sources, units and assumptions. Keep your method separate from the result, mark unanswered questions, and review the output against the checklist.
An example
A one-to-many join can repeat customer rows.
Your task
Join customers and orders and reconcile row counts and totals.
Start with this source
Read the indicated section relevant to joins and row multiplication and complete the applied task.
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Your learning checklist
Required items: 0 / 10 completed or already known
Next: Read a role through its responsibilities
Checklist statuses are self-reported; exercise scores are recorded separately. You can reset any item.
Try a practice set
Calculations and choices receive immediate checks. Review open responses yourself against the rubric. All examples are educational.