请教：大家帮看下这个存储过程这样写有何问题

Create Procedure Employee_Age
    @Language nvarchar(5),        --语言类型
    @UserId int,                        --用户ID
    @StartDate nvarchar(10),        --开始时间
    @EndDate nvarchar(10)        --截止时间
As
    Declare @strSql nvarchar(2000)
    Declare @strWhere nvarchar(2000)
    Declare @strTotal nvarchar(4000)

Set @strWhere=' Where e.DepartmentID=d.DepartmentID and e.CompanyID=d.CompanyID and e.DepartmentID=ud.DepartmentID and ud.UserID='+@UserId+'    and (Left(IncumbencyStatus,1)<>1 and JoinDate>='''+@StartDate+''') or (Left(IncumbencyStatus,1)=1 and  DimissionDate<'''+@EndDate+''') Group By d.DepartmentName Order By d.DepartmentName'

print @strWhere