结果返回零

Question

不知道我在这里缺少什么.

我使用以下代码

DECLARE @sqlText nvarchar(4000)
SET @sqlText = N'SELECT InitialComment, DATEDIFF(d, InitialComment, GETDATE() ) AS Duration FROM dbo.SocialManagementTracker;'

DECLARE @newVal nvarchar(4000)
SET @newVal = ''

exec sp_executesql @sqlText, @newVal out

UPDATE dbo.SocialManagementTracker
SET DaysToResolve = @newVal
WHERE SocialID = 2

比较日期为2018/07/08和2018/08/31.我的结果应该是23.为什么这会返回0而不是？

Answer 1

我在这里看不到动态sql的任何原因...这应该工作正常:

UPDATE dbo.SocialManagementTracker
SET DaysToResolve =  DATEDIFF(day, InitialComment, GETDATE() )
WHERE SocialID = 2