Convert(nvarchar,RequestID) ---------------此句为把类型INT的RequestID转换为类型nvarchar
'CDE'+Convert(nvarchar,RequestID)------CDE字符串与 类型转换后的RequestID并接
=====================如下://==========================
SELECT T1.ID, T1.Name,T1.Result, T1.Remark, T1.Date, T1.Role, ('CDE '+Convert(nvarchar,T1.RequestID))as RequestID, T2.SName FROM ApprovalResult AS T1 INNER JOIN CDE.dbo.CDE_Stage AS T2 ON T1.Name = T2.SNo WHERE ('CDE '+Convert(nvarchar,RequestID) = @asFolio)