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Second-Highest Usage Per Account
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Second-Highest Usage Per Account

MediumSQL · PostgreSQL

Problem

Write a query to find the second-highest network usage day for each active customer account at AT&T.

Daily usage may be recorded in multiple rows for the same account and date. Return only active accounts with at least two distinct usage days.

Output

  1. One row per active account's second-highest usage day, including ties.
  2. Columns: account_id, account_name, usage_date, and total_usage_gb.
  3. Sort by account_id, then usage_date ascending.

Schema

customer_accounts
ColumnTypeDescription
account_idPKINTUnique customer account identifier
account_nameVARCHAR(100)Customer account display name
is_activeBOOLEANWhether the account is currently active
network_usage
ColumnTypeDescription
usage_idPKINTUnique network usage record identifier
account_idINTCustomer account associated with the usage record
usage_dateDATEDate on which network usage occurred
usage_gbNUMERIC(10,2)Network usage measured in gigabytes
Tablescustomer_accountsnetwork_usage
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Your question is Second-Highest Usage Per Account. Start with the requirements and the two tables in the Question tab.

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