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Monthly Sales Aggregation by Product Category

MediumSQL · PostgreSQL00:00
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Your question is Monthly Sales Aggregation by Product Category. Start with the requirements and the two tables on the right.

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Problem

Scenario

A retail analytics team wants to analyze monthly sales performance by product category. You are given two tables: sales records individual sales transactions, and products contains product details.

Task

Write a SQL query to calculate the total sales amount for each product category and month.

Requirements

  1. Join sales and products to associate each sale with its category.
  2. Group results by product category and month (in YYYY-MM format).
  3. Calculate the total sales amount per group.
  4. Return only groups where the total sales amount is greater than zero.
  5. Order the output by month ascending, then by category ascending.

Schema

sales
ColumnTypeDescription
idPKINTPrimary key for sales records
product_idINTForeign key referencing products
sale_dateDATEDate of the sale
amountDECIMAL(10,2)Sale amount
products
ColumnTypeDescription
idPKINTPrimary key for product records
nameVARCHAR(255)Name of the product
categoryVARCHAR(255)Category of the product
Tablessalesproducts
Your solutionPostgreSQL
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