Question

我有代码根据某些逻辑选择价格。我们的选择是目标保证金，平均历史价格和市场价格（这些都已计算完毕）。有时候，我们想忽略这种逻辑并明确地说'＃34;对于这个模型，请使用这个价格，而不是它已经选择的价格＆＃34;。但我也持有我用过的价格。所以这对我的价格没有任何问题：

Update A
Set [Price] = Case
    When [Logic Override] = 1 THEN [Target Margin Price]
    When [Logic Override] = 2 THEN [Average Historical Price]
    When [Logic Override] = 3 THEN [Market Price]
    Else [Price]
    END
From PriceTable A
Where ([Logic Override] <> 4 and [Logic Override] is not null)
and [Model_ID] = Coalesce(NullIf(@ModelID, ''), [Model_ID])

我希望能够做的还是设置[定价方法]。如果逻辑覆盖是1，我必须创建一个全新的案例陈述，当我真正想要做的是将价格和定价方法分别设置为20美元和“目标保证金”时。我似乎无法获得正确的语法来执行此操作。

Answer 1

您可以在所有列中创建多个sql逻辑（只要您尝试更新同一个表）。

您期望的结果令人困惑，并且不确定您实际需要什么，但我希望这有助于您了解使用每个不同的WHERE子句更新多个列。我认为你试图问。

 Update A
 Set [Price] = (Select Case
                    When [Logic Override] = 1 THEN [Target Margin Price]
                    When [Logic Override] = 2 THEN [Average Historical Price]
                    When [Logic Override] = 3 THEN [Market Price]
                    Else [Price]
                   END
                   From PriceTable A
                    Where ([Logic Override] <> 4 and [Logic Override] is not null)
                    and [Model_ID] = Coalesce(NullIf(@ModelID, ''), [Model_ID]),

      [Pricing Method] = (Select '$20' as [Pricing Method] from PriceTable A where [logic 
      Override] = 1),

      [Price] =  (Select '$20' as [Price] from PriceTable A where [logic Override] = 1),
      [Target Margin]  = (Select '$20' as [Target Margin] from PriceTable A where [logic Override] = 1)

From PriceTable

我实际上并不推荐这些类型的更新，因为它们很难维护（如果有多个逻辑，表等需要更新，这很麻烦）。我建议您为每个列创建一个更新，以便您的同行更容易维护，阅读和理解。但对他自己来说。

Answer 2

我尝试将它们作为两个单独的案例陈述连续编写，只有第一个更新了价格。第二个根本没有更新。所以它选择了合适的价格，但不是正确的定价方法。这是实际工作的。

Update A
Set [Price] = Case
When [Logic Override] = 1 THEN [Target Margin Price]
When [Logic Override] = 2 THEN [Average Historical Price]
When [Logic Override] = 3 THEN [Market Price]
Else [FRP]
END,

[Pricing Method] = Case
When [Logic Override] = 1 THEN 'Target Margin'
When [Logic Override] = 2 THEN 'Historical Average'
When [Logic Override] = 3 THEN 'Market Price'
Else [FRP]
END

From PriceTable A
Where ([Logic Override] <> 0 and [Logic Override] is not null)
and [Model_ID] = Coalesce(NullIf(@ModelID, ''), [Model_ID])

我真的不确定为什么我无法使用两个单独的更新语句，但由于这有效，我并不太担心。它的代码比我想要的多，但我不太担心，因为它有效。

来自1个案例的SQL Update 2列

2 个答案: