Top 50 transactions Interview Questions
The most frequently asked transactions questions across all roles and companies, ranked by real interview frequency. Updated weekly.
Explain the four ACID properties and why they matter for reliable transaction processing in SQL systems.
Pocket FmExplain PostgreSQL isolation levels and how they prevent dirty reads, non-repeatable reads, and phantom reads in payment workflows.
RevolutExplain ACID properties and how they protect transactional data integrity in a PostgreSQL system.
NiCETests your ability to write safe, correct SQL transactions with integrity guarantees.
PublixTests consistency approaches using isolation levels, constraints, and correct transaction boundaries.
LabcorpTests your understanding of SQL programmability and when to use each construct.
Mphasis
Speridian TechnologiesEvaluates advanced data modeling and correctness for transactional state management.
ClearUse CTEs, joins, CASE, and null handling to clean sparse assessment scores and impute missing values per question.
MercorUse joins, CTEs, CASE, and null handling to quantify missing tracking data by campaign and channel.
Arthur J. Gallagher &Use a CTE, joins, and ROW_NUMBER to deduplicate raw delivery events and flag missing milestone dates in vehicle delivery timelines.
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Evaluates system design skills for high-throughput transaction processing at POS360.
POS360