🔹 场景2：考勤打卡重复时间戳→ GROUP BY精准去重 🔹 场景3：采购清单重复物料→ 窗口函数标记保留最新 🔹 场景4：问卷调查重复提交→ 自连接查重逻辑 🔹 场景5：多表合并重复项→ UNION自动去重黑科技 场景1：销售表重复客户记录 → 1行DISTINCT搞定 痛点 ...

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