Hierarchical Aggregation using the ROLLUP Extension

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Hierarchical Aggregation using the ROLLUP Extension

ROLLUP is an extension of the GROUP BY clause that produces subtotal rows in addition to the regular grouped rows. It creates a hierarchy of aggregates, moving from the most detailed level (region and city) up to a grand total, which is essential for reporting and OLAP operations.

snippet.sql
sql
SELECT region, city, SUM(revenue) 
FROM sales_data 
GROUP BY ROLLUP (region, city);

Breakdown

SELECT region, city, SUM(revenue)

Defines the dimensions and the measure to be aggregated.

GROUP BY ROLLUP (region, city)

Specifies the hierarchy for subtotal generation (Region > City > Grand Total).

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Hierarchical Aggregation using the ROLLUP Extension

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