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Top 50 transactions Interview Questions

The most frequently asked transactions questions across all roles and companies, ranked by real interview frequency. Updated daily.

50questions
~18htotal time
78companies covered
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1
SQL & Data ManipulationStart here. 38 questions · ~806 min
SQL Month-Over-Month RetentionMedium
Practice
Recently asked

Calculate monthly active-user retention for Unity Ads using CTEs, joins, date truncation, and conditional aggregation.

Window FunctionsRetentiontransactionsInsurifyUnityDoorDash
Rolling 7-Day Transaction AverageMedium
Practice
Recently asked

Calculate each customer's 7-day transaction average using daily aggregation and a PostgreSQL window frame.

Window FunctionstransactionsRunning TotalsTruistBBVAQuantexa
SQL Duplicate Record CleanupMedium
Practice
Recently asked

Identify duplicate transaction rows, retain the earliest record, and delete later duplicates safely.

deduplicationdata cleaningtransactionsOracleAmexBrooksource
Detect Duplicate Transactions in 5 MinutesHard
Practice
Recently asked

Use window functions and conditional aggregation to flag completed transactions that may duplicate one another within five minutes.

Window FunctionsLag/LeadtransactionsRevolutRobinhood
Top Purchases Per CategoryMedium
Practice
Recently asked

Use ROW_NUMBER and a user join to find the three highest completed AARP Rewards purchases per user category.

Data AnalysissqltransactionsAARPInsight GlobalSony
Transactions in Data SystemsMedium
Practice
Recently asked

Summarize transaction duration and failed requests to support reasoning about concurrent database operations.

deadlockstransactionsACIDZscaler
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2
Coding12 questions · ~254 min
Transactional In-Memory Key-Value StoreHard
Practice
Recently asked

Implement nested key-value transactions with set, get, delete, commit, and rollback using layered state.

Hash Tablescoding challengedata persistenceRRippling (Australia)NetflixThumbtack
Transaction Totals Per MinuteEasy
Practice
Recently asked

Aggregate Ramp card transaction amounts into contiguous minute buckets using a hash map.

aggregationtransactionsRAMP Consulting GroupRamp
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