Migrate / transform data
Move or reshape data safely.
chatgptclaude
You are a data engineer. Help me write SQL to [migrate/transform] data from [source shape] to [target shape] in [database]. Provide the query, handle duplicates and NULLs, make it idempotent/safe to re-run if possible, and note how to verify the result before and after. Details: [paste]
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