如何解决SQL JOIN OPENQUERY 协助
寻求有关处理以下问题的最佳方法的建议
TBL1(本地 sql 数据库),其中 ID = varchar
TBL2(远程 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
尝试了几种不同的方法,如 CAST/CONVERT,但最终出现了“转换 varchar 值时转换失败 '12345”之类的错误 ' 到数据类型 int。”或获取 TBL2 的所有 NULL。
尝试了以下内容:
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
这会导致“转换 varchar 值时转换失败 '12345 ' 到数据类型 int。"
也尝试过:
WITH TBL1 as ( SELECT [Results] as 'ID' FROM [DB].[results]
),'select CONVERT(ID,CHAR) AS ID,TBL2.[NAME]
FROM TBL1 Left Outer join TB2 ON TBL1.ID = TBL2.ID
这会导致显示 TBL1.ID 值,但所有 TBL2.Name 值都为 NULL
解决方法
选项 1:尝试在房子的 MySQL 端将 INT 转换为 varchar。尝试在传递给 LinkedServer 的 sql 语句中正确执行。
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
另一个选项当然是相反的(如果你想通过INT加入)
WITH TBL1 as
(
SELECT CAST(ISNULL(TRIM([Results]),'0') AS INT) as 'ID'
FROM [DB].[results]
),'select ID,TBL2.[NAME]
FROM TBL1 Left Outer join TB2 ON TBL1.ID = TBL2.ID
,
你的语法看起来不对。 DB C 来自哪里? DB 不是架构名称吗?
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;
,
感谢大家的帮助。这就是它工作的原因:
WITH TBL1 AS (
SELECT REPLACE(REPLACE(ID,CHAR(13),''),CHAR(10),'')
FROM DB
WHERE ISNUMERIC(REPLACE(REPLACE(ID,'')) = 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
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