D8LooP - Practise Data Engineering

Preparing your workspaceloading the brief, studio & canvas…

buyersellerlistingorder

SCENARIO

You've joined Shoply. Any item on an order can be partially refunded — one of the three laptops came back — and occasionally support issues a goodwill credit against an order with no specific item at all. And there is a question you have to answer rather than dodge: when a refund is processed today against an order placed last month, does last month's reported number change?

your model must answer

01The current net total of an order after refunds?
02Every refund on an order, with amount and date?
03Net sales per day for last week?

out of scopeReturns logistics · restocking · tax · chargebacks · store credit

This exercise’s brief could not be loaded.The guided questions and their model answers come from the review service. It looks like it is not reachable — start it with pnpm dev:api and reload.The canvas below still works, so you can model now and run the review once the service is up.

Build starts here

The brief becomes the left drawer. The canvas stays the build surface.Study is done above. Build the tables here, hit review to validate, then use follow-ups to defend the model.

Practice studio

Ctrl/Cmd + C copyCtrl/Cmd + V pasteCtrl/Cmd + Z undoDelete remove

Start with the data model, then layer system context

Use entities and relationships for the real ERD. Add notes, containers, or curated cloud shapes only when they sharpen the story you are architecting.

68%

You built the model in the Studio. Now defend it.Refunds without double counting

Design review

The reviewer reads your model.

Preparing your workspaceloading the brief, studio & canvas…

buyersellerlistingorder

SCENARIO

your model must answer

01The current net total of an order after refunds?
02Every refund on an order, with amount and date?
03Net sales per day for last week?

out of scopeReturns logistics · restocking · tax · chargebacks · store credit

Build starts here

The brief becomes the left drawer. The canvas stays the build surface.Study is done above. Build the tables here, hit review to validate, then use follow-ups to defend the model.

Practice studio

Ctrl/Cmd + C copyCtrl/Cmd + V pasteCtrl/Cmd + Z undoDelete remove

Start with the data model, then layer system context

Use entities and relationships for the real ERD. Add notes, containers, or curated cloud shapes only when they sharpen the story you are architecting.

68%

You built the model in the Studio. Now defend it.Refunds without double counting

Design review