Syntax for TSQL Query and CTE query - tsql

Question

I'm going to post my query at the end of this post here, but just exposition is required first. Please ignore the column names and table names but I have syntax errors in two spots. When I put this query with my CTE it tells me I have to first 'terminate the previous statement with a ;' Then I go onto alias a column name in the CTE and then it says 'The multi-part identifier "E.ActiveAGVs" could not be bound.'
I hope that I am explaining my problem well enough. If anyone can see what I'm trying to do and let me know if it will work or correct my syntax errors, I would really appreciate it.
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

Answer 1

All CTEs that you need to define for a statement, must go at the beginning of the statement. Even though the CTEs are going to be used only in one of the subqueries, the syntax still requires them to be placed at the beginning of the entire statement, not at the beginning of the particular subquery where they are actually referenced.
Therefore, your statement should probably look something like this:
; -- 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

Answer 2

A common table expression (CTE) must be separated from any prior statement by a semicolon (;). If no statements precede the with then there is no need for a semicolon.
You can have multiple CTEs within a single with. An example follows:
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
Like the rest of the people trying to help, I have no idea of what your SQL is trying to do.