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Star schema in plain language: what leaders should fund in the model

You are funding relationships and ownership — not just dashboard pages. Starve flat-file models early.

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January 4, 20241 min readBy Power BI Analytics Team

A star schema puts facts (transactions, balances) in the center and dimensions (customer, product, date) around them. Flat Excel exports look faster to build and become impossible to filter consistently across reports.

Fund these model assets

  • One marked Date table shared across finance models — not a copy-pasted Calendar per PBIX with different fiscal starts.
  • Conformed Customer/Product dimensions owned by a steward; reports do not invent alternate keys.
  • Facts at agreed grain (invoice line vs header) documented so CALCULATE arguments stop fighting.

Anti-patterns to defund

Shadow datasets in My Workspace that duplicate corporate facts. Bidirectional spiders that “fix filters” but break totals. Importing the same ERP extract five times with slightly different Power Query filters — refresh history fills with Conflicts and analysts disagree by 2%. Prefer a warehouse or dataflow stage once, then thin Import models.

Ask for a relationship view screenshot in reviews: if you cannot see a clear star, budget more modeling time before more report pages.

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Illustrative KPI view

Sample model

Revenue

$13.3M

+4.6% vs LY

Gross margin

30.8%

+1.1 pts

Decision cycle time

9.7 days

-1.1 days

Open exceptions

45

+4 vs last week

Trailing 12 periodsvs plan
On track
74%
Watch
18%
Critical
7%

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