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SQL: Failed Attempts Then Success
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SQL: Failed Attempts Then Success

MediumSQL · PostgreSQL

Problem

Write a SQL query to identify users who have had more than three failed transaction attempts followed by a successful one within a 10-minute window at Sift.

Use the users and transaction_attempts tables. Return each qualifying user once, using their earliest qualifying successful transaction.

Output

  1. One row per qualifying user, with user_id, successful_attempt_id, successful_at, and failed_attempt_count
  2. Include only users with more than three failed attempts in the preceding ten minutes
  3. Order by user_id ascending, then successful_attempt_id ascending

Schema

users
ColumnTypeDescription
user_idPKINTUnique Sift user identifier
emailVARCHAR(255)User email address
transaction_attempts
ColumnTypeDescription
attempt_idPKINTUnique transaction attempt identifier
user_idINTUser associated with the attempt
statusVARCHAR(20)Attempt outcome, such as failed or success
attempted_atTIMESTAMPTZTimestamp when the attempt occurred
Tablesuserstransaction_attempts
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