使用sp_executesql时列名无效

当我试图在存储过程中执行动态查询时，我得到了一个错误

我的代码是：

DECLARE @Query nvarchar(max)
DECLARE @AllowanceBadge nvarchar(20)
DECLARE @AllowFieldName nvarchar(50)
DECLARE @Amount Decimal
SET @AllowanceBadge  ='SIP0980'
SET @AllowFieldName ='xxxxx'
SET @Amount = 100

SET @Query = 'UPDATE tbl_PayrollTransaction SET '+ @AllowFieldName +' = '+convert(varchar,@Amount) + 'WHERE BadgeNumber = '+@AllowanceBadge
            EXEC SP_EXECUTESQL @Query

我有以下错误

味精207，第16级，状态1，第1行
列名“SIP0980”无效

告诉我哪里错了

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谢谢

需要有关SIP0890的报价吗

DECLARE @Query nvarchar(max)
DECLARE @AllowanceBadge nvarchar(20)
DECLARE @AllowFieldName nvarchar(50)
DECLARE @Amount Decimal
SET @AllowanceBadge  ='SIP0980'
SET @AllowFieldName ='xxxxx'
SET @Amount = 100

SET @Query = 'UPDATE tbl_PayrollTransaction SET '+ @AllowFieldName +' = '+convert(varchar,@Amount) + 'WHERE BadgeNumber = '''+@AllowanceBadge+''''
            EXEC SP_EXECUTESQL @Query