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Converting SCD0 to SCD3

SQLeasy0.6 min readPremium
Frequency
Low
Asked at 1 company
Category
487
questions in SQL
Difficulty Split
130E|271M|86H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
Nagarro
Key Concepts Tested
sql
Expert AnswerPremium
118 wordsInterview-ready
**Architectural Logic**: SCD0 (no history) to SCD3 (current + previous value) adds limited history without full Type 2 complexity. **Migration**: Add prev_value and effective_from columns; on update, shift current→previous before applying new value. **SQL**: `UPDATE dim SET prev_value = current_value, current_value = new_value, updated_at = NOW() WHERE key = X`. Or MERGE with equivalent logic....
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