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Top 3 Customers by Monthly Usage
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Top 3 Customers by Monthly Usage

MediumSQL · PostgreSQL

Problem

Write a SQL query to find the top 3 customers with the highest data usage per month over the last year at Vodafone. Use the provided Vodafone customer, account, and usage data. Include months represented by qualifying usage records during the trailing 12-month period.

Output

  1. One row per customer-month among the top three customers for that month.
  2. Columns: usage_month, customer_id, customer_name, total_data_usage_mb, and monthly_rank.
  3. Return at most three rows per month, ordered by usage_month, then monthly_rank, then customer_id. Break equal usage totals by the lower customer_id.

Schema

customers
ColumnTypeDescription
customer_idPKINTUnique Vodafone customer identifier
customer_nameVARCHAR(100)Customer display name
customer_accounts
ColumnTypeDescription
account_idPKINTUnique mobile account identifier
customer_idINTCustomer who owns the account
account_numberVARCHAR(30)Vodafone account reference
data_usage
ColumnTypeDescription
usage_idPKINTUnique usage record identifier
account_idINTAccount that generated the usage
usage_dateDATEDate of recorded data usage
data_usage_mbNUMERIC(12,2)Data consumed in megabytes
session_statusVARCHAR(20)Usage session status
Tablescustomerscustomer_accountsdata_usage
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