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SQL Top 10 Sales Query

EasySQL · PostgreSQL00:00
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Your question is SQL Top 10 Sales Query. Start with the requirements and the three tables on the right.

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Problem

Checkr's product analytics team wants to identify the products generating the most sales. Write a PostgreSQL query that returns the top 10 products by completed sales during the previous calendar quarter. For the sample data, assume the reporting date is 2025-01-15, so the previous quarter is October 1 through December 31, 2024.

Requirements

  1. Join orders, order_items, and products.
  2. Include only orders with status = 'completed' from the previous calendar quarter. Use an inclusive start date and exclusive end date.
  3. Calculate sales as quantity * unit_price, aggregated by product.
  4. Return the product name and total sales, ordered from highest to lowest, with a deterministic product-name tie-breaker. Return only the top 10 products.

Representative Data

The data includes completed, cancelled, out-of-quarter, and null-status orders. Product Background Check API has no sales in the previous quarter, and product Identity Verification ranks eleventh.

Schema

products
ColumnTypeDescription
product_idPKINTUnique product identifier
product_nameVARCHAR(100)Checkr product name
orders
ColumnTypeDescription
order_idPKINTUnique order identifier
order_dateDATEDate the order was placed
statusVARCHAR(20)Order processing status
order_items
ColumnTypeDescription
order_item_idPKINTUnique order-line identifier
order_idINTRelated order identifier
product_idINTRelated product identifier
quantityINTNumber of units purchased
unit_priceNUMERIC(10,2)Price charged per unit
Tablesproductsordersorder_items
Your solutionPostgreSQL
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