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我怎麼會選擇不同的用的名字和姓氏的所有行類似的行(在某些列相等)和那裏的重複選擇一個具有較高SomeDate,那麼Id如果仍然重複例如如何篩選出基於其他列的數據
爲:
| Id | Forename | Surname | SomeDate | ---------------------------------------- | 1 | Bill | Power | 2011-01-01 | | 2 | James | Joyce | 2011-02-01 | | 3 | Peter | Lennon | 2011-03-01 | | 4 | John | Sellers | 2011-04-01 | | 5 | James | Joyce | 2011-05-01 | | 6 | Peter | Lennon | 2011-03-01 |
結果:
| Id | Forename | Surname | SomeDate | ---------------------------------------- | 1 | Bill | Power | 2011-01-01 | | 4 | John | Sellers | 2011-04-01 | | 5 | James | Joyce | 2011-05-01 | | 6 | Peter | Lennon | 2011-03-01 |
我怎麼會在
- T-SQL
- 從一個DataTable使用C#實現這個