Power BI Relationships: What They Are & Why They Matter
In Power BI, relationships connect tables using a shared column (like ProductID
) so your data model can work properly. Without them, your visuals may be wrong or incomplete.
📘 What’s a Relationship?
A relationship tells Power BI how two tables are linked. For example:
-
Sales.ProductID
connects toProducts.ProductID
- This lets Power BI know which product each sale refers to
🔢 Types of Relationships
- One-to-Many (1:*) – Most common (e.g., Products → Sales)
- Many-to-Many (:) – Needs careful handling or a bridge table
- One-to-One (1:1) – Rare but useful in master-detail scenarios
✅ Why It Matters
- Accurate visuals: Relationships ensure correct totals and filtering
- Better models: Cleaner structure with separate tables
- Faster reports: Power BI performs better with proper relationships
-
DAX support: Functions like
RELATED()
depend on them
NB:
- Makes sure one table has unique values
- Avoid bi-directional filters unless needed
- Use a star schema (fact table at center, dimension tables around)
📌 Strong relationships equals(=) strong reports. Takes a few minutes to review them before you build!
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