SQL 服務器中的 Case 表達式中的 WHEN ELSE

Question

我正在我的 SQL 服務器中編寫case表達式，我想在 else 塊中添加硬編碼值。

我想檢查 case 表達式，如果下面的 DHB output 是2.1和ABC001那么它應該顯示ABC Hospital的硬編碼值。

SELECT DISTINCT
    userid, 
    CASE 
       WHEN CHARINDEX('-', e.name) > 0 
          THEN Ltrim(Rtrim(substring(e.name,0, charIndex('-', e.name)))) 
       ELSE e.name 
    END as DHB      
FROM
    [Table1].[dbo].Event ae
JOIN
    [Portal].[dbo].cUser cu ON cu.name = ae.userID
JOIN
    [Portal].[dbo].UAttribute ua ON ua.cUser = cu.uniqueId
JOIN
    [Portal].[dbo].[EIdentifier] ei ON ei.cUser = cu.uniqueId
JOIN
    [Portal].[dbo].[EIdentifierType] e ON e.uniqueId = ei.externalIdentifierType
WHERE
    (e.name LIKE '%ABC001%' OR e.name LIKE '2.1')
    AND userId = 'Al5'

當前 output

          userid    DHB
           Al5     2.1
           Al5      ABC001
           Bl5     3.1
           Bl5      CDE001

預期 output

          userid    DHB
           Al5     ABC Hospital
           Bl5      EFG Hospital

我在下面嘗試了這樣的事情

CASE WHEN Ltrim(Rtrim(substring(e.name,0, charIndex('-', e.name)))) = 'ABC001' THEN 'ABC Hospital'
      WHEN e.name = '2.1' THEN 'ABC Hospital'
      ELSE e.name 'ABC Hospital'
  END as DHB 

但它不允許我輸入ELSE e.name 'ABC Hospital' 。

任何幫助都非常感謝！

Answer 1

我能夠解決您的問題並更新查詢以滿足您的需求。

SELECT DISTINCT userid,
CASE WHEN DHB in ('2.1','ABC001') THEN 'ABC Hospital'
ELSE DHB END 
FROM 
(
SELECT 
    userid, 
    CASE 
       WHEN CHARINDEX('-', e.name) > 0 
          THEN Ltrim(Rtrim(substring(e.name,0, charIndex('-', e.name)))) 
       ELSE e.name 
    END as DHB      
FROM
    [Table1].[dbo].Event ae
JOIN
    [Portal].[dbo].cUser cu ON cu.name = ae.userID
JOIN
    [Portal].[dbo].UAttribute ua ON ua.cUser = cu.uniqueId
JOIN
    [Portal].[dbo].[EIdentifier] ei ON ei.cUser = cu.uniqueId
JOIN
    [Portal].[dbo].[EIdentifierType] e ON e.uniqueId = ei.externalIdentifierType
WHERE
    (e.name LIKE '%ABC001%' OR e.name LIKE '2.1')
    AND userId = 'Al5'
) as aa