Questions and answers for DE interviews
Master SQL CTEs and subqueries. Learn when to use each, how to chain multiple CTEs, recursive CTEs for hierarchies, deduplication patterns, and real-world data engineering examples.
SQL CTEs and Subqueries Explained: When to Use Each and Why CTEs Win Read More »
Prepare for data engineering interviews with 20 essential questions covering pipeline design, data modeling, ETL vs ELT, star schema, SCD, batch vs streaming, data quality, PII handling, and orchestration.
Top 20 Data Engineering Interview Questions: Concepts Every Candidate Must Know Read More »
Master every SQL join type with visual diagrams and real examples. Covers INNER, LEFT, RIGHT, FULL OUTER, CROSS, and SELF joins, plus ON vs WHERE, CTEs with joins, performance tips, and interview questions.
SQL Joins Explained: INNER, LEFT, RIGHT, FULL, CROSS, and SELF Joins with Real Examples Read More »
Master SQL window functions with real examples. Covers ROW_NUMBER, RANK, DENSE_RANK, NTILE, LAG, LEAD, running totals, moving averages, frame clauses, and the most common interview questions.
SQL Window Functions Explained: ROW_NUMBER, RANK, DENSE_RANK, LAG, LEAD, and More Read More »
Prepare for your Azure Data Factory interview with 15 real questions and detailed answers. Covers pipelines, activities, metadata-driven patterns, incremental loading, error handling, triggers, and performance optimization.
Top 15 Azure Data Factory Interview Questions Every Data Engineer Should Know Read More »
