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Duplicate Transactions Query
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Duplicate Transactions Query

MediumSQL · PostgreSQL

Problem

Mastercard Decision Intelligence needs to flag potentially duplicated card authorizations before they are reviewed for fraud or processing errors. Write a PostgreSQL query that compares transactions against other transactions from the same card token, merchant, currency, and amount.

Requirements

  1. Treat a transaction as a duplicate candidate when the matching transaction occurs after it and no more than two minutes later.
  2. Include only transactions with an approved status, and exclude the original transaction from matching with itself.
  3. Use ROW_NUMBER() to rank duplicate candidates chronologically for each original transaction.
  4. Return the original and duplicate transaction IDs, matching attributes, timestamps, and the candidate rank, ordered by original transaction and rank.

Schema

card_transactions
ColumnTypeDescription
transaction_idPKBIGINTUnique authorization identifier
card_tokenVARCHAR(64)Tokenized card identifier
merchant_idVARCHAR(32)Merchant identifier
amountNUMERIC(12,2)Authorization amount
currencyCHAR(3)ISO currency code
transaction_tsTIMESTAMPTZAuthorization timestamp
statusVARCHAR(20)Authorization status
Tablescard_transactions
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