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我正在尝试在'Value'列中根据前一行记录在'Increment'列中执行一些操作SQL Server逐行操作
例如,
row_num| Period | Measure | Decay
1 | Jan 08 | 10 |
2 | Feb 08 | 18 |
3 | Mar 08 | 7 |
4 | Apr 08 | 67 |
我想基于公式
row_num| Period | Measure| Decay
1 | Jan 08 | 10 | = 10 -> first value in 'Measures'
2 | Feb 08 | 18 | = 10*0.5+18 = 23 -> previous decay record *0.5 + current measure
3 | Mar 08 | 7 | = 23*0.5+7 = 18.5
4 | Apr 08 | 67 | = 18.5*0.5+67 = 76.25
将光标适用这里更新列“衰变”?语法怎么样? 谢谢
6个问题,0接受? “再见。 – egrunin 2010-07-07 04:57:40
很酷。谢谢!不知道它是这样工作的 – marilyn 2010-07-07 08:39:45