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Top Underperforming Regions by Growth

MediumSQL · PostgreSQL00:00
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Your question is Top Underperforming Regions by Growth. Start with the requirements and the two tables on the right.

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Problem

Ventura Foods Operations needs to identify regions with declining revenue. Assume the analysis date is 2025-07-15, so the last completed quarter is Q2 2025 and the comparison quarter is Q1 2025. Write a PostgreSQL query to return the three most underperforming regions.

Requirements

  1. Aggregate revenue for each region in Q1 2025 and Q2 2025.
  2. Calculate percentage growth as (Q2 revenue - Q1 revenue) / Q1 revenue * 100.
  3. Rank regions from lowest to highest growth and return the three weakest regions. Regions without prior-quarter revenue should have a NULL growth rate and appear after regions with calculable growth.

Schema

regions
ColumnTypeDescription
region_idPKINTUnique region identifier
region_nameVARCHAR(100)Ventura Foods sales region name
sales
ColumnTypeDescription
sale_idPKINTUnique sale identifier
region_idINTRegion associated with the sale
sale_dateDATEDate the revenue was recorded
revenueNUMERIC(12,2)Revenue amount for the sale
Tablesregionssales
Your solutionPostgreSQL
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