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我将在本文末尾发布我的查询，但首先需要说明。请忽略列名和表名，但我在两个地方有语法错误。当我将此查询与我的 CTE 一起使用时，它告诉我必须首先“用 ; 终止前一个语句” 然后我在 CTE 中使用别名列名，然后它说“无法绑定多部分标识符“E.ActiveAGVs”。

我希望我能很好地解释我的问题。如果有人能看到我正在尝试做的事情并让我知道它是否会起作用或纠正我的语法错误，我将非常感激。

Select A.move_hour as 'Hour', 
       isnull(B.move_count,0) as 'Current_Count', 
       isnull(C.move_count,0) as '1_Day_Previous', 
       isnull(D.move_count,0) as '2_Day_Previous',
       ISNULL (E.ActiveAGVs,0) as 'Active AGV''s'
           --^ Error right here
from
   (select distinct(DATEPART(HH, Move_History.Move_Dt)) as move_hour 
   from Move_History 
   where Plant_Id = 1 and Building_Id = 1) as A
left outer join
   (select datepart(HH,Move_History.Move_Dt) as move_hour, 
           Move_History.Move_Cnt as move_count 
   from Move_History 
Group by datepart(HH,Move_History.Move_Dt), Move_Cnt) as B on A.move_hour = B.move_hour
left outer join
(select datepart(HH,Move_History.Move_Dt) as move_hour, Move_History.Move_Cnt as       move_count 
from Move_History 
Group by datepart(HH,Move_History.Move_Dt), Move_Cnt) as C on A.move_hour = C.move_hour
left outer join
(select datepart(HH,Move_History.Move_Dt) as move_hour, Move_History.Move_Cnt as move_count 
from Move_History 
Group by datepart(HH,Move_History.Move_Dt), Move_Cnt) as D on A.move_hour = D.move_hour;
with const as (
    select cast(cast(getdate() as date) as datetime) as midnight
    ),
allhours as (
    select 0 as m_hour, midnight as timestart, dateadd(hour, 1, midnight) as timeend from const union all
   ...
    select 23 as m_hour, dateadd(hour, 23, midnight) as timestart, dateadd(hour, 24, midnight) as timeend from const
   ) 
(select ah.m_hour,
   (sum(datediff(SECOND, timestart), ah.timeend else dt.End_Dt end)) 
   / 18000.0) * 5 as ActiveAGVs              
from allhours as ah
 left outer join AGV_Report as dt
 on ah.timestart< coalesce(dt.End_dt, getdate()) and
    ah.timeend >= dt.Begin_Dt
Group by datepart(SECOND,ah.hour), ah.timestart) as E on A.move_hour = E.move_hour
                                   --^ 'Incorrect syntax near "as"'
 where A.move_hour is not null
order by ah.m_hour asc
4

2 回答 2

1

您需要为语句定义的所有 CTE 必须位于语句的开头。即使 CTE 仅用于其中一个子查询，语法仍然要求将它们放置在整个语句的开头，而不是实际引用它们的特定子查询的开头。

因此，您的陈述应该看起来像这样：

;  -- required if there are statements preceding
with const as (
    select cast(cast(getdate() as date) as datetime) as midnight
    ),
allhours as (
    select
       0 as m_hour,
       midnight as timestart,
       dateadd(hour, 1, midnight) as timeend
    from const
    union all
   ...
    select
       23 as m_hour,
       dateadd(hour, 23, midnight) as timestart,
       dateadd(hour, 24, midnight) as timeend
    from const
   )
Select A.move_hour as 'Hour', 
       isnull(B.move_count,0) as 'Current_Count', 
       isnull(C.move_count,0) as '1_Day_Previous', 
       isnull(D.move_count,0) as '2_Day_Previous',
       ISNULL (E.ActiveAGVs,0) as 'Active AGV''s'
from
   (
      select distinct
         DATEPART(HH, Move_History.Move_Dt) as move_hour 
      from Move_History 
      where Plant_Id = 1 and Building_Id = 1
   ) as A
left outer join
   (
      select
         datepart(HH,Move_History.Move_Dt) as move_hour, 
         Move_History.Move_Cnt as move_count 
      from Move_History 
      Group by datepart(HH,Move_History.Move_Dt), Move_Cnt
   ) as B on A.move_hour = B.move_hour
left outer join
   (
      select
         datepart(HH,Move_History.Move_Dt) as move_hour,
         Move_History.Move_Cnt as move_count 
      from Move_History 
      Group by datepart(HH,Move_History.Move_Dt), Move_Cnt
   ) as C on A.move_hour = C.move_hour
left outer join
   (
      select
         datepart(HH,Move_History.Move_Dt) as move_hour,
         Move_History.Move_Cnt as move_count 
      from Move_History 
      Group by datepart(HH,Move_History.Move_Dt), Move_Cnt
   ) as D on A.move_hour = D.move_hour
left outer join  -- assuming...
   (
      select
         ah.m_hour,
         (sum(datediff(SECOND, timestart), ah.timeend else dt.End_Dt end))
         / 18000.0) * 5 as ActiveAGVs              
      from allhours as ah
      left outer join AGV_Report as dt
         on ah.timestart < coalesce(dt.End_dt, getdate())
        and ah.timeend >= dt.Begin_Dt
      Group by datepart(SECOND,ah.hour), ah.timestart
   ) as E on A.move_hour = E.move_hour
where A.move_hour is not null
order by ah.m_hour asc
于 2012-09-17T20:06:25.767 回答
0

公用表表达式 (CTE) 必须用分号 (;) 与任何先前的语句分隔。如果在 the 之前没有语句，with则不需要分号。

您可以在单个with. 一个例子如下：

with
  -- Counting numbers.
  Numbers as (
    select 1 as Number
    union all
    select Numbers.Number + 1
      from Numbers
      where Number < 10 ),
  -- Squares of counting numbers.
  Squares as (
    select Number, Number * Number as Square
      from Numbers )
  -- Result.
  select Number, Square
    from Squares

像其他试图提供帮助的人一样，我不知道你的 SQL 试图做什么。

于 2012-09-17T19:26:46.427 回答