Primary Dimension
Overview
The Primary Dimension in ReOrc Views serves as the key identifier that defines the root Cube for the join path. It establishes a structured relationship for combining multiple data sources, ensuring accurate and efficient data retrieval.
Purpose of the Primary Dimension
Defines the Root Cube: Determines the starting point for joining multiple Cubes within the View.
Ensures Consistent Data Relationships: Helps maintain a structured and logical data flow by guiding how joins are applied across related datasets.
Optimizes Query Performance: Provides a predefined path for data aggregation, reducing unnecessary joins and improving efficiency.
Supports Business Logic: Ensures that the View aligns with reporting needs by structuring data based on the most relevant business entity.
Impact of Primary Dimension on Query Results
The choice of Primary Dimension can significantly influence the outcome of queries and reports. Below are examples of how it affects results:
Example 1: Customer-Centric vs. Order-Centric View
Primary Dimension:
Customer IDThe View will group data around customers.
Aggregations such as total spend per customer will be calculated at the customer level.
A customer with multiple orders will have their data merged, displaying cumulative totals.
Order without customers will not be show in this scenario.
Primary Dimension:
Order IDThe View will group data by individual orders.
Each order will be treated as a separate record, displaying order-level details.
Orders without customer will be available.
Example 2: Sales Data with Different Primary Dimensions
Primary Dimension:
Product IDThe View will show total sales grouped by product.
Metrics like average revenue per product will be straightforward to compute.
Primary Dimension:
Region IDThe View will aggregate sales data based on geographical regions.
Queries will focus on regional trends rather than product-level sales.
Set Primary Dimension
To set primary dimension for a view, mouse over to the dimension that you would like to set as the primary dimension and click on ..., select Set as primary dimension
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