SQL 加入開放查詢協助

Question

尋求有關處理以下問題的最佳方法的建議

TBL1（本地 SQL DB）其中 ID = varchar

TBL2（遠程 MYSQL DB），其中 ID = INT

WITH TBL1 as (
SELECT 
     [Results]  as 'ID'
 FROM [DB].[results]
),

TBL2 as (


select * from openquery(LINKEDSERVER,'select  ID, Name from DB')

) 

Select  
   TBL1.[ID],

   TBL2.[NAME] 
FROM [DB]
left outer JOIN TBL1 ON TBL1.ID = TBL2.ID

嘗試了幾種不同的方法，如 CAST/CONVERT，但最終出現“將 varchar 值 '12345' 轉換為數據類型 int 時轉換失敗”之類的錯誤。 或獲取 TBL2 的所有 NULLS。

嘗試了以下操作：

WITH TBL1 as 
( 
SELECT CAST(ISNULL([Results],'0') AS INT) as 'ID' 
FROM [DB].[results] 
), 
TBL2 as ( select * from openquery(LINKEDSERVER,'select ID, Name from DB') 
) 

Select TBL1.[ID], TBL2.[NAME] 
FROM TBL1 Left Outer join TB2 ON TBL1.ID = TBL2.ID

這導致“將 varchar 值 '12345' 轉換為數據類型 int 時轉換失敗。”

還嘗試過：

WITH TBL1 as ( SELECT [Results] as 'ID' FROM [DB].[results] 
), 

TBL2 as ( select * from openquery(LINKEDSERVER,'select CONVERT(ID, CHAR) AS ID, Name from DB') 
) 

Select TBL1.[ID], TBL2.[NAME] 
FROM TBL1 Left Outer join TB2 ON TBL1.ID = TBL2.ID 

這會導致顯示 TBL1.ID 值，但所有 TBL2.Name 值都是 NULL

Answer 1

選項 1：嘗試在房子的 MySQL 一側將 INT 轉換為 varchar。 嘗試在您傳遞給 LinkedServer 的 sql 語句中正確執行此操作。

WITH TBL1 as ( SELECT [Results] as 'ID' FROM [DB].[results] 
), 

TBL2 as ( select * from openquery(LINKEDSERVER,'select CONVERT(ID, CHAR) AS ID, Name from DB') 
) 

Select TBL1.[ID], TBL2.[NAME] 
FROM TBL1 Left Outer join TB2 ON TBL1.ID = TBL2.ID 

另一個選項當然是相反的（如果你想通過 INT 加入）

WITH TBL1 as 
( 
SELECT CAST(ISNULL(TRIM([Results]),'0') AS INT) as 'ID' 
FROM [DB].[results] 
), 
TBL2 as ( select * from openquery(LINKEDSERVER,'select ID, Name from DB') 
) 

Select TBL1.[ID], TBL2.[NAME] 
FROM TBL1 Left Outer join TB2 ON TBL1.ID = TBL2.ID 

Answer 2

您的語法看起來不正確。 DB C 從何而來？ DB不是模式名稱嗎？

WITH TBL1 as (
SELECT 
     [Results]  as ID
 FROM [DB].[results]
),
TBL2 as (
    select * from openquery(LINKEDSERVER,'select  ID, Name from DB')
) 

Select  
   TBL1.[ID],
   TBL2.[NAME] 
FROM TBL2 left outer JOIN TBL1 ON try_cast(TBL1.ID as int) = TBL2.ID;

Answer 3

感謝大家的幫助。 這就是使它起作用的原因：

WITH TBL1 AS (
    SELECT REPLACE(REPLACE(ID, CHAR(13), ''), CHAR(10), '') 
    FROM DB
    WHERE ISNUMERIC(REPLACE(REPLACE(ID, CHAR(13), ''), CHAR(10), '')) = 1

),
TBL2 AS (
    SELECT *
    FROM OpenQuery(
        LINKEDSERVER,
        'SELECT id, name FROM DB'
    )
)
SELECT 
    TBL1.ID
    ,TB2.Name
FROM TBL2
LEFT OUTER JOIN TBL1 ON TBL1.ID = TBL2.id