Sql 将字符串替换为要联接的Id时无法联接表

我有以下资料：

[Main].[Relation]
'SalesMan1'
'Supplier1'
'Customer2'

SQL查询：

SELECT * 
FROM [Main] [M]
INNER JOIN [SalesMan] [S]
ON [S].[Id] = Replace([M].[Relation],'SalesMan','')
WHERE [M].[Relation] LIKE 'SalesMan%'


Getting exeception :
**Conversion failed when converting the nvarchar value 'Supplier1' to data type int.**

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将字符串替换为要联接的Id时，我无法联接表。关于如何解决它有什么想法吗？

不要使用

=

像

SELECT * 
FROM   [Main] [M] INNER JOIN 
       [SalesMan] [S] ON [S].[Id] = CAST(REPLACE([M].[Relation],'SalesMan','') AS INT)
WHERE  [M].[Relation] LIKE 'SalesMan%'