创建索引视图

Question

当我尝试创建索引视图时，出现错误“datepart 返回不确定性值，使用系统定义的确定性函数或使用户定义的函数返回确定性值” 当我尝试在视图上创建索引时，出现此错误

。查询是

CREATE VIEW dbo.two_weeks_performance WITH SCHEMABINDING
as 
  SELECT dbo.day_dim.date_time AS Date, dbo.order_dim.quantity AS Target_Acheived
    FROM dbo.day_dim 
    JOIN dbo.order_fact ON dbo.day_dim.day_id = dbo.order_fact.day_id 
    JOIN dbo.branch_dim ON dbo.order_fact.branch_id = dbo.branch_dim.branch_id 
    JOIN dbo.order_dim ON dbo.order_fact.order_id = dbo.order_dim.order_id
   WHERE (DATEPART(wk, CONVERT(datetime, dbo.day_dim.date_time, 101)) <= DATEPART(wk, GETDATE() - 2))
GROUP BY dbo.order_dim.quantity, dbo.day_dim.date_time
GO
CREATE UNIQUE CLUSTERED INDEX two_weeks_performance_I on two_weeks_performance (Date,Target_Acheived)`

在这个date_time是varchar(30)类型。给我一个解决方案来解决这个问题。

Answer 1

使用：

CREATE VIEW dbo.two_weeks_performance WITH SCHEMABINDING
AS 
  SELECT dbo.day_dim.date_time AS Date, 
         dbo.order_dim.quantity AS Target_Acheived
    FROM dbo.day_dim 
    JOIN dbo.order_fact ON dbo.day_dim.day_id = dbo.order_fact.day_id 
    JOIN dbo.branch_dim ON dbo.order_fact.branch_id = dbo.branch_dim.branch_id 
    JOIN dbo.order_dim ON dbo.order_fact.order_id = dbo.order_dim.order_id   
GROUP BY dbo.order_dim.quantity, dbo.day_dim.date_time

问题是 GETDATE() 的使用；它是不确定的，每次都会返回不同的值。

所以你必须使用：

SELECT t.*
  FROM dbo.two_weeks_performance t
 WHERE DATEPART(wk, CONVERT(datetime, t.date, 101)) <= DATEPART(wk, GETDATE() - 2)