在DATEDIFF之后使用CASE邏輯

Question

我正在成功使用DATEDIFF邏輯來計算Age。 然后，我需要能夠使用Age並將其用作CASE邏輯中的一列。 當我嘗試這樣做時，SMS用紅色下划線標記Age（年齡），並指出這是無效列。 我怎樣才能解決這個問題？

USE DataWarehouse
SELECT DISTINCT
M.[Account Name Birth Date] as 'Birth Date',
M.[Mailing Address State] as 'State',
E.[ANSVIES2] as 'Income',
E.[FICO] as 'FICO Score',

DATEDIFF(DD,M.[Account Name Birth Date],GETDATE())/365 as [Age],

CASE WHEN [Age] >= 18 AND [Age] <= 34 AND E.[ANSVIES2] >= 50 THEN 'Credit 
Driven'
WHEN [Age] < 45 AND E.[ANSVIES2] < 50 THEN 'Fee Driven'
WHEN [Age] >= 35 AND [Age] <= 54 AND E.[ANSVIES2] >= 50 AND E.[ANSVIES2] <= 
125 THEN 'Middle Market'
WHEN [Age] >= 45 AND E.[ANSVIES2] < 50 THEN 'Low Income Depositor'
WHEN [Age] >= 55 AND E.[ANSVIES2] >= 50 AND E.[ANSVIES2] <= 125 THEN 'Middle 
Income Depositor'
WHEN [Age] >= 35 AND E.[ANSVIES2] >= 125 THEN 'Upscale'
ELSE 'Unclassified' END as 'Consumer Segment'

Answer 1

或使用子選擇（不是最佳方法，具體取決於您的數據庫大小和索引，臨時表或臨時表可能會更好，具體取決於您的位置，但這應該可以）：

   Select CASE WHEN [Age] >= 18 AND [Age] <= 34 AND E.[ANSVIES2] >= 50 THEN 'Credit 
Driven'
WHEN [Age] < 45 AND E.[ANSVIES2] < 50 THEN 'Fee Driven'
WHEN [Age] >= 35 AND [Age] <= 54 AND E.[ANSVIES2] >= 50 AND E.[ANSVIES2] <= 
125 THEN 'Middle Market'
WHEN [Age] >= 45 AND E.[ANSVIES2] < 50 THEN 'Low Income Depositor'
WHEN [Age] >= 55 AND E.[ANSVIES2] >= 50 AND E.[ANSVIES2] <= 125 THEN 'Middle 
Income Depositor'
WHEN [Age] >= 35 AND E.[ANSVIES2] >= 125 THEN 'Upscale'
ELSE 'Unclassified' END as 'Consumer Segment'
, OtherColumnsHere
FROM (
     SELECT DISTINCT
     M.[Account Name Birth Date] as 'Birth Date',
     M.[Mailing Address State] as 'State',
     E.[ANSVIES2] as 'Income',
     E.[FICO] as 'FICO Score',    
     DATEDIFF(DD,M.[Account Name Birth Date],GETDATE())/365 as [Age],
     FROM RestOfYourSelectStatementHere
) SubSelect

Answer 2

SSMS突出顯示語法的原因是由於SQL的邏輯處理順序 。

簡而言之，在選擇階段中使用的別名“ Age ”不能在同一階段中引用-可以在后續階段中引用（例如，下一階段-ORDER BY ）。

因此，一項工作是創建CTE或嵌套表 。

查詢的邏輯步驟順序：

1. 從/加入/申請/ PIVOT / UNPIVOT
2. 哪里
3. 通過...分組
4. HAVING
5. 選擇列表/ DISTINCT
6. 訂購
7. 上下偏移

Answer 3

您不需要使用subquery您可以直接將其表示為使用value構造：

 SELECT  . . . ,
        (CASE WHEN tt.Age >= 18 AND tt.Age <= 34 AND t.[ANSVIES2] >= 50 
              THEN 'Credit Driven'
              WHEN [Age] < 45 AND E.[ANSVIES2] < 50 THEN 'Fee Driven'
              WHEN [Age] >= 35 AND [Age] <= 54 AND 
                   E.[ANSVIES2] >= 50 AND E.[ANSVIES2] <= 125 
              THEN 'Middle Market'
              WHEN [Age] >= 45 AND E.[ANSVIES2] < 50 
              THEN 'Low Income Depositor'
              WHEN [Age] >= 55 AND E.[ANSVIES2] >= 50 AND E.[ANSVIES2] <= 125 
              THEN 'Middle Income Depositor'
              WHEN [Age] >= 35 AND E.[ANSVIES2] >= 125 THEN 'Upscale'
              ELSE 'Unclassified'
         END) AS [Consumer Segment]
FROM table t 
CROSS APPLY (VALUES 
                (DATEDIFF(DD, t.[Account Name Birth Date],GETDATE())/365)
            ) tt(Age); 

Answer 4

上面發布的代碼由於某些原因無法正常工作。 我能夠成功實現此解決方案-

USE DataWarehouse
SELECT DISTINCT
M.[Symitar Account Id] as 'Symitar ID',
M.[Account Name Birth Date] as 'Birth Date',
M.[Account Name Death Date] as 'Death Date',
M.[Mailing Address State] as 'State',
E.[ANSVIES2] as 'Income',
E.[FICO] as 'FICO Score',
M.[Loan Type] as 'Loan Description',
M.[Loan Type Code] as 'Loan Type',
M.[Share Type] as 'Share Description',
M.[Share Type Code] as 'Share Type',

DATEDIFF(DD,M.[Account Name Birth Date],GETDATE())/365 as [Age],

CASE WHEN DATEDIFF(DD,M.[Account Name Birth Date],GETDATE())/365 >= 18 AND 
DATEDIFF(DD,M.[Account Name Birth Date],
GETDATE())/365 <= 34 AND E.[ANSVIES2] >= 50 THEN 'Credit Driven'
WHEN DATEDIFF(DD,M.[Account Name Birth Date],GETDATE())/365 < 45 AND E. 
[ANSVIES2] < 50 THEN 'Fee Driven'
WHEN DATEDIFF(DD,M.[Account Name Birth Date],GETDATE())/365 >= 35 AND 
DATEDIFF(DD,M.[Account Name Birth Date],
GETDATE())/365 <= 54 AND E.[ANSVIES2] >= 50 AND E.[ANSVIES2] <= 125 THEN 
'Middle Market'
WHEN DATEDIFF(DD,M.[Account Name Birth Date],GETDATE())/365 >= 45 AND E. 
[ANSVIES2] < 50 THEN 'Low Income Depositor'
WHEN DATEDIFF(DD,M.[Account Name Birth Date],GETDATE())/365 >= 55 AND E. 
[ANSVIES2] >= 50 AND E.[ANSVIES2] <= 125 
THEN 'Middle Income Depositor'
WHEN DATEDIFF(DD,M.[Account Name Birth Date],GETDATE())/365 >= 35 AND E. 
[ANSVIES2] >= 125 THEN 'Upscale'
ELSE 'Unclassified' END as 'Consumer Segment'

FROM Accounts.ExperianData E
INNER JOIN Accounts.MemberCube M
ON E.[Symitar Account Id] = M.[Symitar Account Id]
WHERE M.[Account Name Type] = 'Primary' AND /* Primary acct holders */
M.[Account Status] = 'Open' AND 
M.[Account Type] IN ('General Membership', 'Indirect Account', 'Employee Acc 
ount') AND 
/* Remove businesses and internal accounts */
M.[Account Name Birth Date] <= '05/18/1997' /* Older than 21 */ AND
M.[Mailing Address State] IN('UT', 'ID', 'AZ', 'NV', 'NM')