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我有一个表是这样的:我如何比较和保持一定的价值:SQL Server 2008 R2的
ITEM | DATE | PRICE | NEW_PRICE | REDUCTION |
Pencil | 01/10/14 | 25 | 21 | 4 |
Pencil | 01/12/14 | 21 | 21 | 0 |
Pencil | 01/30/14 | 21 | 21 | 0 |
Pencil | 02/05/14 | 21 | 18 | 3 |
Pencil | 02/17/14 | 18 | 18 | 0 |
Pencil | 03/20/14 | 18 | 18 | 0 |
Pencil | 06/08/14 | 18 | 16 | 2 |
Pencil | 07/14/14 | 16 | 16 | 0 |
Pencil | 07/28/14 | 16 | 16 | 0 |
如何选择,所以我可以得到的结果是这样的:
ITEM | DATE | PRICE | NEW_PRICE | REDUCTION | REDUCTION_HOLD |
Pencil | 01/10/14 | 25 | 21 | 4 | 4 |
Pencil | 01/12/14 | 21 | 21 | 0 | 4 |
Pencil | 01/30/14 | 21 | 21 | 0 | 4 |
Pencil | 02/05/14 | 21 | 18 | 3 | 3 |
Pencil | 02/17/14 | 18 | 18 | 0 | 3 |
Pencil | 03/20/14 | 18 | 18 | 0 | 3 |
Pencil | 06/08/14 | 18 | 16 | 2 | 2 |
Pencil | 07/14/14 | 16 | 16 | 0 | 2 |
Pencil | 07/28/14 | 16 | 16 | 0 | 2 |
提前致谢。
工作就像一个魅力,Mr.Bjørnbeth,你救了我的一天!谢谢 ! :d – RahdixC9 2014-12-02 08:34:13