SCD Type 4: hybrid—current in main dim, history in separate table. Main table: one row per key (Type 1 style). History table: all changes (Type 2 style). Query current: main table. Query history: history table. Balances performance (current) with full audit (history). Implement:...
This easy-level SQL question appears frequently in data engineering interviews at companies like Myntra. While less common, it tests deeper understanding that distinguishes strong candidates.
Start by clearly defining the core concept being asked about. Interviewers want to see that you understand the fundamentals before diving into implementation details. Structure your answer with a definition, then explain the practical application with a concise example.
SCD Type 4: hybrid—current in main dim, history in separate table. Main table: one row per key (Type 1 style). History table: all changes (Type 2 style). Query current: main table. Query history: history table. Balances performance (current) with full audit (history). Implement: main table overwrite; history table append on change. Why it matters: Design choices compound at scale—wrong approach can cause 100× overhead. Scalability trade-offs: Profile before optimizing; validate on sample then full. Cost implications: Suboptimal choices multiply at billion-row scale.
Want feedback on your answer?
Paste your answer to this question and our AI Coach scores it, finds gaps, and shows you the FAANG-level version.
Get the most asked SQL questions with expert answers. Instant download.
No spam. Unsubscribe anytime.
Paste your answer and get instant AI feedback with a FAANG-level improved version.
Analyze My Answer — FreeAccording to DataEngPrep.tech, this is one of the most frequently asked SQL interview questions, reported at 1 company. DataEngPrep.tech maintains a curated database of 1,863+ real data engineering interview questions across 7 categories, verified by industry professionals.