"Arithmetic overflow error converting expression to data type nvarchar."

Question

我正在尝试比较 2 个表之间的数据，我需要将多个列作为复合键连接起来以获得唯一标识符。我正在使用 CTE，我的代码是：

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]
)

不幸的是我得到了

Arithmetic overflow error converting expression to data type nvarchar.

有什么想法吗？

Answer 1

当您将数字转换为字符串并且字符串不够大时会发生这种情况。我猜这是问题所在：

CAST(SuburbId AS NVARCHAR(1))

如果 SuburbId 是一个大于 9 的数字，那么这将产生一个错误。或者，就此而言，如果值为负，您也会得到相同的错误。

"Arithmetic overflow error converting expression to data type nvarchar."

"Arithmetic overflow error converting expression to data type nvarchar."

sql

sql-server

overflow

common-table-expression

sqldatatypes