ETL Testing Interview Questions and Answers is a well-structured guide created to help candidates prepare for interviews in data testing, data warehousing, and ETL-based roles. This blog covers 30+ frequently asked questions with expert-curated answers on ETL concepts, data validation, transformation rules, SQL queries, test strategies, and performance testing. Whether you're a fresher learning about ETL for the first time or an experienced QA professional looking to refresh your knowledge, this guide covers key topics such as data mapping, source-to-target validation, error handling, and automation using SQL or ETL tools like Informatica, Talend, and SSIS. You’ll also explore real-time project scenarios, test case design, and tips for handling large datasets and production-level issues. With this comprehensive set of questions and answers, you’ll be well-prepared to handle any ETL testing interview with confidence.

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