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Slowly Changing Dimension (SCD) Type 4 - describe hybrid approach

SQLeasy0.4 min readPremium
Frequency
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Asked at 1 company
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487
questions in SQL
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130E|271M|86H
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1,863
across 7 categories
Asked at these companies
Myntra
Expert AnswerPremium
82 wordsInterview-ready
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....
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