Incorrect Syntax near With - sql

Question

No matter where I place my With statement inside the SQL query, the keyword in the next line always shows an error, 'Incorrect syntax near keyword'. I also tried putting semi-colon.
; WITH Commercial_subset AS
(
SELECT DISTINCT
PRDID_Clean, Value, [Year]
FROM
Reporting_db_SPKPI.DBO.[tbl_RCCP_commercial]
WHERE
MEASURE = 'Unit Growth Rate'
)
--error appears at truncate
TRUNCATE TABLE Reporting_db_SPKPI.DBO.[tbl_RCCP_3_NR_dup]
Example 1:
[Example 1][1]
Example 2:
[Example 2][2]
What am I missing?
[1]: https://i.stack.imgur.com/lkfVd.png
[2]: https://i.stack.imgur.com/tZRnG.png
My Final code after getting suggestions in the comments,
--Ensure the correct database is selected for creating the views
USE Reporting_db_SPKPI
--Create the table where new values will be appended
Insert into Reporting_db_SPKPI.DBO.[tbl_RCCP_3_NR_dup]
Select *, Replace(productID,'-','') as ProductID_clean from Reporting_db_SPKPI.DBO.[tbl_RCCP_3_NR]
GO
--Create a subset as view which will be used for join later
Create or Alter View QRY_Commerical_Subset AS
Select Distinct PRDID_Clean, Value, [Year] From Reporting_db_SPKPI.DBO.[tbl_RCCP_commercial] where MEASURE = 'Unit Growth Rate'
Go
--Create a view with distinct list of all SKUs
CREATE OR ALTER VIEW QRY_RCCP_TEMP AS
SELECT
PRODUCTID, ROW_NUMBER() Over (ORDER BY ProductID) AS ID
FROM (
SELECT
DISTINCT A.ProductID_clean ProductID
FROM
Reporting_db_SPKPI.DBO.[tbl_RCCP_3_NR_dup] A
LEFT JOIN
Reporting_db_SPKPI.DBO.QRY_Commerical_Subset B ON A.ProductID_clean = B.PRDID_Clean
WHERE
B.PRDID_Clean IS NOT NULL --and A.filename = 'Capacity Planning_INS_Springhill' --DYNAMIC VARIABLE HERE
and Cast(A.SnapshotDate as date) =
(SELECT Max(Cast(SnapshotDate as date)) FROM reporting_db_spkpi.dbo.tbl_RCCP_3_NR)
) T
GO
SET NOCOUNT ON
-- For every product id from the distinct list iterate the following the code
DECLARE #I INT = 1
WHILE #I <= (SELECT MAX(ID) FROM QRY_RCCP_TEMP)
BEGIN
DECLARE #PRODUCT NVARCHAR(50) = (SELECT PRODUCTID FROM QRY_RCCP_TEMP WHERE ID = #I)
DROP TABLE Reporting_db_SPKPI.DBO.[tbl_RCCP_3_NR_temp]
--Retrieve last 12 months of value from NR and add it to a temp table in increasing order of their months. These 12 data points will be baseline
SELECT
Top 12 A.*,
Case When B.[Value] is Null then 0 else CAST(B.[Value] as float) End GROWTH
INTO
Reporting_db_SPKPI.DBO.[tbl_RCCP_3_NR_temp]
FROM
Reporting_db_SPKPI.DBO.[tbl_RCCP_3_NR_dup] A
LEFT JOIN
--using the view here
QRY_Commerical_Subset B ON B.PRDID_Clean = A.ProductID_clean AND B.[YEAR] = YEAR(A.[MONTH])+1
WHERE
A.PRODUCTID= #PRODUCT
AND Cast(A.SnapshotDate AS DATE) = (SELECT Max(Cast(SnapshotDate AS DATE)) FROM reporting_db_spkpi.dbo.[tbl_RCCP_3_NR_dup])
Order by
[Month] desc
-- Generate 3 years of data
DECLARE #J INT = 1
WHILE #J<=3
BEGIN
--Calculate next year's value
UPDATE Reporting_db_SPKPI.DBO.[tbl_RCCP_3_NR_temp]
SET
[Value] = [Value]*(1+ GROWTH),
[MONTH] = DATEADD(YEAR,1,[Month]),
MonthCode= 'F' + CAST(CAST(SUBSTRING(MonthCode,2,LEN(MonthCode)) AS INT) + 12 AS NVARCHAR(10))
--Add it to the NR table.
Insert into Reporting_db_SPKPI.DBO.[tbl_RCCP_3_NR_dup]
(ProductID, MonthCode, Value, Month, FileName,
LastModifiedDate, SnapshotDate, Quarter, IsError, ErrorDescription)
Select
ProductID, MonthCode, Value, Month, FileName,
LastModifiedDate, SnapshotDate, Quarter, IsError, ErrorDescription
from
Reporting_db_SPKPI.DBO.[tbl_RCCP_3_NR_temp]
--Update growth rate for next year
UPDATE Reporting_db_SPKPI.DBO.[tbl_RCCP_3_NR_temp]
SET GROWTH = Case When B.[Value] is Null then 0 else CAST(B.[Value] as float) End
FROM Reporting_db_SPKPI.DBO.QRY_Commerical_Subset B
WHERE B.PRDID_Clean = ProductID_clean AND [YEAR] = YEAR([MONTH])+1
SET #J=#J+1
END
SET #I=#I+1
END
DROP VIEW QRY_RCCP_TEMP
DROP VIEW QRY_Commerical_Subset

Answer 1

The WITH is a Common Table Expression, aka CTE.
And a CTE is like a template for a sub-query.
For example this join of the same sub-query:
SELECT *
FROM (
select distinct bar
from table1
where foo = 'baz'
) AS foo1
JOIN (
select distinct bar
from table1
where foo = 'baz'
) AS foo2
ON foo1.bar > foo2.bar
Can be written as
WITH CTE_FOO AS (
select distinct bar
from table1
where foo = 'baz'
)
SELECT *
FROM CTE_FOO AS foo1
JOIN CTE_FOO AS foo2
ON foo1.bar > foo2.bar
It's meant to be used with a SELECT.
Not with a TRUNCATE TABLE or DROP TABLE.
(It can be used with an UPDATE though)
As such, treat the TRUNCATE as a seperate statement.
TRUNCATE TABLE Reporting_db_SPKPI.DBO.[tbl_RCCP_3_NR_dup];
WITH Commercial_subset AS
(
SELECT DISTINCT
PRDID_Clean, Value, [Year]
FROM
Reporting_db_SPKPI.DBO.[tbl_RCCP_commercial]
WHERE
MEASURE = 'Unit Growth Rate'
)
SELECT *
FROM Commercial_subset;
Btw, the reason why many write a CTE with a leading ; is because the WITH clause raises an error if the previous statement wasn't ended with a ;. It's just a small trick to avoid that error.