将varchar值','转换为数据类型int时转换失败

Question

这是我的SQL查询

DECLARE @Amount int
SELECT @Amount = COALESCE(@Amount+ ', ', '') + Amount FROM Hotel

执行此查询时,我收到错误:

"Conversion failed when converting the varchar value ', ' to data type int"

Answer 1

您需要显式地将数字转换为字符串,否则它将尝试从字符串到数字进行隐式转换.

同时将变量声明为正确的数据类型...

 DECLARE @Amount varchar(max)
 SELECT @Amount = COALESCE(@Amount+ ', ', '') + CAST(Amount AS VARCHAR(11))
 FROM Hotel

你可能也想XML PATH在2008年看到这个.