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Top-Selling Products by Region
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Top-Selling Products by Region

MediumSQL · PostgreSQL

Problem

Nike wants to identify the best-selling products in each retail region for the last completed quarter, April 1 through June 30, 2025. Write a PostgreSQL query that summarizes completed sales and ranks products within each region.

Requirements

  1. Join sales to products and stores to obtain product names and regions.
  2. Include only completed sales from April 1, 2025 through June 30, 2025, excluding rows with no region.
  3. Calculate total units sold for each product and region, then return the top two products per region using a window function.
  4. Sort the final results by region and rank.

Schema

sales
ColumnTypeDescription
sale_idPKINTUnique sale identifier
product_idINTReferenced Nike product
store_idINTReferenced Nike store
sale_dateDATEDate of the sale
units_soldINTNumber of units in the sale
statusVARCHAR(20)Transaction status
products
ColumnTypeDescription
product_idPKINTUnique product identifier
product_nameVARCHAR(100)Nike product name
stores
ColumnTypeDescription
store_idPKINTUnique store identifier
store_nameVARCHAR(100)Nike store name
regionVARCHAR(50)Geographic sales region
Tablessalesproductsstores
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