CARD91 Interview Questions
The questions to prepare for CARD91 interviews, across all roles. Questions from real interview reports rank first. Updated daily.
Explain how INNER JOIN and LEFT JOIN differ, and when to use each for matched-only versus all-left-row analysis.
Explain the four ACID properties and why they matter for reliable transaction processing in SQL systems.
Explain the purpose of using indexes in databases and their impact on query performance.
Explain core Java concepts and produce an aggregated SQL access summary using joins.
SaviyntReturn cardholders whose 2025 approved transaction total is at least 1000 across multiple transaction records.
MastercardUse SQL to identify active engineers with both Java and SQL experience and report their experience levels.
General Dynamics Information TechnologyExplain how to derive time and space complexity for a coding solution, including loops, recursion, and auxiliary memory.
Tests your understanding of Java collections tradeoffs and when to choose each in real applications.
Tests your algorithmic thinking and ability to choose efficient sorting strategies.
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Tests your approach to reliability, error handling, and maintainable failure modes.
Tests your understanding of core Java OOP constructs and when to use each.