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想知道是否有人可以就如何最有效地规范化下表提供一些指导，以便我可以创建可刷新的视图/表。

表格1：

SYSTEM_KEY | ID | ORDER | ORDER_STATUS | SYSTEM_Actions
A             1   Pencil   Open          Shipped   
B             1   Pencil   Open          Tested  
C             1   Pencil   Open          Shipped    
A             1   Paper    Closed        Delivered

我希望以可重复的方式将此表标准化为如下所示：

结果：

ID | ORDER | Order Status | A_actions | B_Actions | C_Actions 
1    Pencil  OPEN           Shipped     Tested      Delivered                   
1    Paper   Closed         Delivered    null       null

我能够通过做类似的事情来实现这一点

Select full.ID, full.order, full.orderstatus, case when system_ID = 'A' then sysa.system_actions as A_actions, ....{for B, C} 
from table1 full
left join table1 sysa on full.id = sysa.id and full.order = sysa.order
left join table1 sysb on full.id = sysb.id and full.order = sysb.order

虽然这似乎可行，但在必须使用多个临时表的可重复性方面非常笨拙。

有谁知道我是否可以实现这一目标的好方法？

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1 回答 1

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尝试使用 group by 子句

select id,order,order_status,
       case when system_ID = 'A' then system_actions as A_actions,
       case when system_ID = 'B' then system_actions as B_actions,
       case when system_ID = 'C' then system_actions as C_actions
from table1
group by id,order,order_status
于 2013-07-08T12:11:36.800 回答