Sybase + 如何计算特定组的序列号

Question

Date      column1 column2 column3 column4 column5
01-Jan-17 A       AB      10      AB_1    10
02-Jan-17 B       AB      20      AB_2    10
03-Jan-17 C       AB      30      AB_3    10
04-Jan-17 D       AB      20      AB_4    -10
05-Jan-17 E       AB      40      AB_5    20
06-Jan-17 X       GH      30      GH_1    30
07-Jan-17 V       GH      40      GH_2    10
08-Jan-17 A       GH      50      GH_3    10

要求1：对于column2中所有具有相同值的列，column4应该按顺序编号

要求2：对于column2中所有具有相同值的列，column5应该计算为column3的当前值-column3的先前值

感谢您的帮助！！

我正在使用 Adaptive Server Enterprise/15.7/EBF 22234 SMP SP121 /P/x86_64/Enterprise Linux/ase157sp12x/3660/64-bit/FBO/

Answer 1

您可以通过如下多步处理来实现此目的（我没有测试它，但您会明白的）。假设你的 table 被命名为 't'.

select your_date, column1, column2, column3, id = identity(9) into #t1 from t order by column2, column3  -- this seems to be the ordering you want?

select column2, min(id) as min_id into #t2 from #t1 group by column2

select #t1.* column4 = (#t1.id - #t2.min_id + 1) into #t3 from #t1, #t2 where #t2.column2 = #t1.column2

select ta.*, column5 = case when tb.id is null or tb.column2 <> ta.column2 then ta.column3 else ta.column3 - tb.column3 from #t3 ta, #t1 tb where ta.id *= (tb.id - 1)

Sybase + 如何计算特定组的序列号

Sybase + how to compute sequence number for a speicific group

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