Top Users by Recent Transaction Volume | Dataford Interview Questions

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The question is on your right: Top Users by Recent Transaction Volume. Read through the requirements and the three tables first.

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Problem

FinEdge wants a report of the most active users by recent completed transaction volume. Write a SQL query to return the top 3 users based on completed transactions in the 30-day window ending on 2024-06-30.

Requirements

Use only transactions with status = 'completed'.
Restrict the date range to 2024-05-31 through 2024-06-30, inclusive.
Count only transactions whose card_id belongs to the same user in the cards table.
For each qualifying user, return:
- user_id
- full_name
- country_code
- total_volume as the sum of ABS(amount)
- transaction_count
Order by total_volume descending, then user_id ascending.
Return only the top 3 rows.

Schema

users

Column	Type	Description
user_idPK	INT	Primary key for the user
full_name	VARCHAR(100)	User full name
country_code	VARCHAR(2)	ISO country code
signup_date	DATE	Date the user signed up

transactions

Column	Type	Description
transaction_idPK	INT	Primary key for the transaction
user_id	INT	User who made the transaction
card_id	INT	Card used for the transaction
amount	DECIMAL(12,2)	Signed transaction amount
transaction_date	DATE	Date of the transaction
status	VARCHAR(20)	Transaction status

cards

Column	Type	Description
card_idPK	INT	Primary key for the card
user_id	INT	Owner of the card
card_type	VARCHAR(20)	Type of card
card_status	VARCHAR(30)	Current card status