MERGE handles insert-or-update-or-delete in one statement, the backbone of incremental loads and slowly-changing dimensions. The signal is the matched/not-matched logic and what makes a retry safe.
Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.
MERGE handles insert-or-update-or-delete in one statement, the backbone of incremental loads and slowly-changing dimensions. The signal is the matched/not-matched logic and what makes a retry safe.
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