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Max Profit in DataFrames
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Max Profit in DataFrames

MediumSQL · PostgreSQL

Problem

Given two pandas DataFrames, perform data manipulation to find the maximum-profit region / sales figures

Asked in the round 2 stage. The candidate was asked to code in any editor or notepad and solved it with SQL. Use the regions and sales tables.

Output

  1. Return one row per region tied for the highest profit.
  2. Include region_id, region_name, total_sales, and total_profit.
  3. Consider only completed sales with non-null sales and cost values. Order by total_profit descending, then region_name ascending.

Schema

regions
ColumnTypeDescription
region_idPKINTUnique region identifier
region_nameVARCHAR(100)Region display name
sales
ColumnTypeDescription
sale_idPKINTUnique sale identifier
region_idINTRegion associated with the sale
sale_amountDECIMAL(12,2)Revenue generated by the sale
cost_amountDECIMAL(12,2)Cost associated with the sale
statusVARCHAR(20)Sale processing status
Tablesregionssales
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