Sql &引用；将表达式转换为数据类型nvarchar时出现算术溢出错误。”；

我正在尝试比较两个表之间的数据，在这两个表中，我需要将多个列作为复合键连接起来，以获得唯一标识符。我使用的是CTE，代码是：

WITH SuburbDataTest AS (
  SELECT *
    ,  CAST(Address AS NVARCHAR(100))+' ' +CAST(LivingAddress AS NVARCHAR(2))
    + ' ' + CAST(StartDate AS NVARCHAR(11))+ ' ' +CAST(AddressTypeId AS NVARCHAR(1))
    + ' ' +CAST(SuburbId AS NVARCHAR(1))AS SuburbDataTestColumn
  FROM [mig].[ConsumerAddressMigration]
  WHERE SuburbId is NOT NULL
)
SELECT *
FROM SuburbDataTest staging
WHERE SuburbDataTestColumn IN (
  SELECT Address+' ' +CAST(LivingAddress AS NVARCHAR(2))+ ' '+CAST(StartDate AS NVARCHAR(11))
    + ' ' +CAST(AddressTypeId AS NVARCHAR(1))+ ' ' +CAST(SuburbId AS NVARCHAR(1)) AS SuburbDataTestColumn
  FROM [dbo].[tblConsumerAddress]
)

不幸的是，我越来越

将表达式转换为数据类型nvarchar时出现算术溢出错误

---

有什么想法吗？

当你把一个数字转换成一个字符串，而字符串不够大时，就会发生这种情况。我想这就是问题所在：

CAST(SuburbId AS NVARCHAR(1))

---

如果SuburbId

是一个大于9的数字，那么这将生成一个错误。或者，如果该值为负，您也会得到相同的错误。
我们可以看到[mig].[ConsumerDressMigration]和[dbo].[tblConsumerAddress]的模式吗？Duh！我真是瞎了眼！非常感谢@Gordon Linoff！