Top 3 Sales Per Month | Dataford Interview Questions

Genpact's reporting team needs a monthly sales leaderboard for management review. Write a PostgreSQL query that calculates completed sales for each sales representative by month and returns the top three representatives in every month.

Requirements

Include only orders with status = 'Completed'.
Aggregate order amounts by calendar month and sales representative.
Rank representatives separately within each month using a window function.
Return the month, representative name, total sales, and rank, ordered chronologically and by rank.

Schema

sales_reps

Column	Type	Description
rep_idPK	INT	Primary key for the sales representative
rep_name	VARCHAR(100)	Representative's full name
region	VARCHAR(50)	Representative's assigned region

orders

Column	Type	Description
order_idPK	INT	Primary key for the order
rep_id	INT	Sales representative assigned to the order
order_date	DATE	Date the order was placed
amount	DECIMAL(12,2)	Order value
status	VARCHAR(20)	Order processing status

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