嘗試根據案例聲明創建字段

我在查詢時遇到了一些問題。我試圖確定「類別」字段是A，B還是C，然後根據類別創建字段。該領域將總結支付領域。但我遇到了錯誤，說「附近的關鍵字爲不正確的語法」。我在SQL視圖中創建這個。使用SQL Server 2008嘗試根據案例聲明創建字段

SELECT r.id, r.category 
CASE 
WHEN r.category = 'A' then SUM(r.payment) As A_payments 
WHEN r.category = 'B' then SUM(r.payment) As B_payments 
WHEN r.category = 'C' then SUM(r.payment) As C_payments 
END 
FROM r_invoiceTable As r 
GROUP BY r.id, r.category

我在那裏，因爲我有數據有A，B和C

樣品數據 - r_invoiceTable

Id --- Category ---- Payment 
222  A  ---- 50 
444  A  ---- 30 
111  B  ---- 90 
777  C  ---- 20 
555  C  ---- 40

所有上述情況下應該執行數據期望的輸出 A_payments = 80，B_payments = 90，C_payments = 60

來源

2012-04-06 dido

是的，但我想要有3個獨立的領域......我不能只有一個領域。我需要使用基於類別的付款總和創建3個單獨的字段。對於你計算相同'SUM'的每個類別，都要使用 – dido 2012-04-06 16:38:28

;使用'CASE'有什麼意義？ – mshsayem 2012-04-06 16:42:36

@mshsayem每個類別都會有不同的總和。這就是爲什麼我需要按類別分開 – dido 2012-04-06 16:50:11

也許你正在尋找這樣的：

SELECT 
    SUM(CASE WHEN category = 'A' THEN payment END) AS A_payments, 
    SUM(CASE WHEN category = 'B' THEN payment END) AS B_payments, 
    SUM(CASE WHEN category = 'C' THEN payment END) AS C_payments 
FROM r_invoiceTable

來源

2012-04-06 17:25:44

是的，這是我需要的，謝謝！ – dido 2012-04-06 17:43:00

可能是你想要的（類別明智的支付金額）？：

SELECT r.category, SUM(r.payment) As Payments 
FROM r_invoiceTable As r 
GROUP BY r.category

輸出將是這樣的：

category  Payments 
--------- ------------ 
    A   80 
    B   90 
    C   60

如果你喜歡在一個排在這裏，這些數字是一個天真的做法：

SELECT 
    (SELECT SUM(r.payment) From r_invoiceTable As r Where r.category = 'A') as A_Payment, 
    (SELECT SUM(r.payment) From r_invoiceTable As r Where r.category = 'B') as B_Payment, 
    (SELECT SUM(r.payment) From r_invoiceTable As r Where r.category = 'C') as C_Payment

來源

2012-04-06 16:53:17 mshsayem

那麼，上述解決方案將提供3個獨立的列嗎？因爲在我的Web應用程序中，我必須放置3個獨立的列。 – dido 2012-04-06 17:16:18

SELECT * 
FROM dbo.r_invoiceTable 
PIVOT 
(SUM(payment) 
FOR category IN ([a],[b],[c]) 
) AS pivoted

來源

2012-04-06 17:24:47 Tbonebrad

您必須將源中的列限制爲「payment」和「category」。否則'id'和其他列（如果有的話）也會參與分組。即代替'FROM dbo.r_invoiceTable'，您需要選擇'FROM（SELECT payment，category FROM dbo.r_invoiceTable）alias'。 – 2012-04-06 17:29:25

嘗試根據案例聲明創建字段

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