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Walmart

Senior Software Engineer

UNION vs UNION ALL in SQL

Easy

Round 4 (SQL & Database)general_knowledgeCandidate Selected

Database SQL

What is the difference between UNION and UNION ALL?

This question was asked in

Walmart Senior Software Engineer Interview Experience

The interview process at Walmart consisted of five comprehensive technical rounds covering a broad range of topics. Across the rounds, the candidate was evaluated on Core Java & Concurrency, Spring Boot internal mechanics, Microservices architecture and DevOps practices, SQL queries and indexing, and Low-Level System Design (LLD). Overall, the process was thorough with a medium-to-hard difficulty level, heavily focusing on deep technical understanding, concurrency, and SOLID principles.