粘贴第三方CSV数据至Excel时自动按姓名列去重的需求

Got it, let's break this down into actionable solutions that fit both one-off pastes and ongoing updates. Since your data's already sorted descending by date/time, we can leverage that to make deduplication dead simple—no fancy formulas needed.

方法1：Excel内置删除重复项（适合一次性/低频更新） #

This is the quick-and-dirty approach for when you only need to paste data occasionally:

• Paste your copied CSV data into a blank Excel worksheet (make sure Column A is names, Column B is date/time, and the data stays in that descending time order—critical, because Excel keeps the first occurrence when removing duplicates).
• Select the entire data range (including headers if you have them).
• Go to the Data tab → click the Remove Duplicates button.
• In the pop-up dialog, only check the "姓名" column (uncheck all others) and hit OK.
• Done! Excel will automatically keep the first entry for each name (which is the latest one, thanks to your sorted data) and delete all duplicate name rows below it.

方法2：Power Query自动化（适合高频/持续更新） #

If you're dealing with regular updates, Power Query will save you from repeating the same steps every time:

1. Create a dedicated "Raw Data" worksheet—this is where you'll paste your new CSV data each time (you can overwrite the old data here, or append new rows below if you want to keep a history).
2. Go to the Data tab → click From Table/Range (if your data doesn't have headers, add them first—e.g., A1 = "姓名", B1 = "日期时间").
3. In the Power Query Editor:
   • First, make sure the date/time column is formatted correctly: select Column B, go to the Transform tab → Data Type → Date/Time.
   • Next, remove duplicates by name: select Column A, go to the Home tab → click Remove Duplicates. Since your raw data is sorted descending by time, this keeps the latest entry for each name automatically.
4. Click Close & Load to send the cleaned data to a new worksheet.
5. For future updates: paste your new CSV into the "Raw Data" sheet, then go to the cleaned data worksheet, hit Data → Refresh All—the deduplication happens automatically.

Pro Tip for Full History #

If you want to make sure you don't lose older entries that fall outside the 1000-row grid limit, don't overwrite the "Raw Data" sheet—instead, append new rows to the bottom. Power Query will process the entire history, deduplicate by name, and keep the latest date/time entry for each person.

内容的提问来源于stack exchange，提问作者iq200