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MERGE INTO employees e USING new_data n ON (e.id = n.id) WHEN MATCHED THEN UPDATE SET e.salary = n.salary WHEN NOT MATCHED THEN INSERT (id, salary) VALUES (n.id, n.salary);
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Consequently, the demand for concise, portable, and study materials—specifically PDF notes—is massive. Students want to study offline; professionals want quick reference guides. MERGE INTO employees e USING new_data n ON (e