IIF to Case翻譯

Question

好吧，所以我需要將最初用於訪問數據庫的查詢轉換爲將在SQL-Compact Edition數據庫上運行的查詢。

和查詢我有一個IIF語句（不SQL工作）內

我擡頭一切都表明，我應該用案例時更換。

這是我的原代碼：

Select [OrderNumber], [CustomerName], [PO_TAG], [Shape], [Size], [DrawingNumber], 
[OrderBuildTime], [RequiredDateTime], [LatestStatusTime], [ExpectedCompletionDateTime], 
[DateImported], Sum(IIF([Status] = 'Printed', PanelBuildTime, 0)) AS OrderBuildTimee from 
SteelOrders 
INNER JOIN FinalizedPrintedStickers 
ON 
SteelOrders.OrderNumber = LEFT(FinalizedPrintedStickers.SN,10) 
GROUP BY SteelOrders.OrderNumber, [CustomerName], [PO_TAG], [Shape], [Size], [DrawingNumber], 
[OrderBuildTime], [RequiredDateTime], [LatestStatusTime], [ExpectedCompletionDateTime], 
[DateImported] 

這是IIF聲明：

Sum(IIF([Status] = 'Printed', PanelBuildTime, 0)) AS OrderBuildTimee 

這是我更換了IIF語句：

Sum(CASE Status WHEN 'Printed' THEN PanelBuildTime ELSE 0) AS OrderBuildTimee 

這是代碼的全身看起來像後記：

Select [OrderNumber], 
[CustomerName], 
[PO_TAG], 
[Shape], 
[Size], 
[DrawingNumber], 
[OrderBuildTime], 
[RequiredDateTime], 
[LatestStatusTime], 
[ExpectedCompletionDateTime], 
[DateImported], 
Sum(CASE Status WHEN 'Printed' THEN PanelBuildTime ELSE 0) AS OrderBuildTimee 
From SteelOrders 
INNER JOIN FinalizedPrintedStickers 
ON 
SteelOrders.OrderNumber = LEFT(FinalizedPrintedStickers.SN,10) 
GROUP BY SteelOrders.OrderNumber, [CustomerName], [PO_TAG], [Shape], [Size], [DrawingNumber], 
[OrderBuildTime], [RequiredDateTime], [LatestStatusTime], [ExpectedCompletionDateTime], 
[DateImported] 

這是我新的錯誤消息：

Major Error 0x80040E14, Minor Error 25501 
> Select [OrderNumber], 
[CustomerName], 
[PO_TAG], 
[Shape], 
[Size], 
[DrawingNumber], 
[OrderBuildTime], 
[RequiredDateTime], 
[LatestStatusTime], 
[ExpectedCompletionDateTime], 
[DateImported], 
Sum(CASE Status WHEN 'Printed' THEN PanelBuildTime ELSE 0) AS OrderBuildTimee 
From SteelOrders 
INNER JOIN FinalizedPrintedStickers 
ON 
SteelOrders.OrderNumber = LEFT(FinalizedPrintedStickers.SN,10) 
GROUP BY SteelOrders.OrderNumber, [CustomerName], [PO_TAG], [Shape], [Size], [DrawingNumber], 
[OrderBuildTime], [RequiredDateTime], [LatestStatusTime], [ExpectedCompletionDateTime], 
[DateImported] 
There was an error parsing the query. [ Token line number = 12,Token line offset = 58,Token in 
error =) ] 

Answer 1

的CASE正確的語法是：

Simple CASE expression: 
CASE input_expression 
    WHEN when_expression THEN result_expression [ ...n ] 
    [ ELSE else_result_expression ] 
END 

Searched CASE expression: 
CASE 
    WHEN Boolean_expression THEN result_expression [ ...n ] 
    [ ELSE else_result_expression ] 
END 

在您的查詢中，您缺少END的CASE：

Sum(CASE Status WHEN 'Printed' THEN PanelBuildTime ELSE 0 END) AS OrderBuildTimee 

所以完整的代碼：

Select [OrderNumber], 
    [CustomerName], 
    [PO_TAG], 
    [Shape], 
    [Size], 
    [DrawingNumber], 
    [OrderBuildTime], 
    [RequiredDateTime], 
    [LatestStatusTime], 
    [ExpectedCompletionDateTime], 
    [DateImported], 
    Sum(CASE Status WHEN 'Printed' THEN PanelBuildTime ELSE 0 END) AS OrderBuildTimee 
From SteelOrders 
INNER JOIN FinalizedPrintedStickers 
    -- left not supported by sql server ce use substring 
    -- ON SteelOrders.OrderNumber = LEFT(FinalizedPrintedStickers.SN,10) 
    ON SteelOrders.OrderNumber = substring(FinalizedPrintedStickers.SN, 1, 10) 
GROUP BY SteelOrders.OrderNumber, [CustomerName], [PO_TAG], [Shape], [Size], [DrawingNumber], 
[OrderBuildTime], [RequiredDateTime], [LatestStatusTime], [ExpectedCompletionDateTime], 
[DateImported]