給定一條數據，若數據庫中有則更新該數據，沒有則新增一條數據。使用merge into實現

1.merge into 的語法 MERGE INTO table_name alias1 USING (table | view | sub_query) alias2 ON (join condition) WHEN MATCHED THEN UPDATE table_name SET col1 = col_val1, col2 = col2_val WHEN NOT MATCHED TH

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