Use MAX(Date) value inside a SQL recursion - sql-server

Question

I have SQL query with performs recursion based on selected Min(Date) and Max(Date) from more than 1 table. But when i try to run the query it throws GROUP BY, HAVING, or aggregate functions are not allowed in the recursive part of a recursive common table expression 'ctedaterange'. exception. I also tried using Top 1 Date but still no hope.
SQL Query
ALTER VIEW [dbo].[CYExtraction]
AS
WITH ctedaterange
AS (SELECT
[Dates] = (SELECT
MIN(CreatedOn) AS CreatedOn
FROM (SELECT
MIN(CreatedOn) AS CreatedOn
FROM (SELECT
MIN(CreatedOn) AS CreatedOn
FROM Items) AS it
UNION ALL
SELECT
*
FROM (SELECT
MIN(CreatedOn) AS CreatedOn
FROM Bibs) AS bib
UNION ALL
SELECT
*
FROM (SELECT
MIN(CreatedOn) AS CreatedOn
FROM Porders) AS po) AS AllItems)
UNION ALL
SELECT
[dates] + 1
FROM ctedaterange
WHERE [dates] + 1 <= (SELECT
MAX(CreatedOn) AS CreatedOn
FROM (SELECT
MAX(CreatedOn) AS CreatedOn
FROM (SELECT
MAX(CreatedOn) AS CreatedOn
FROM Items) AS it
UNION ALL
SELECT
*
FROM (SELECT
MAX(CreatedOn) AS CreatedOn
FROM Bibs) AS bib
UNION ALL
SELECT
*
FROM (SELECT
MAX(CreatedOn) AS CreatedOn
FROM Porders) AS po) AS AllItems))
SELECT
[Dates] AS PK_Date,
DATENAME(MONTH, [Dates]) + ' ' + CAST(YEAR([Dates]) AS varchar(4)) AS
Month,
CASE
WHEN DATEPART(m, [Dates]) <= 3 THEN 'Q1 ' + CAST(YEAR([Dates]) AS varchar(4))
ELSE CASE
WHEN DATEPART(m, [Dates]) <= 6 THEN 'Q2 ' + CAST(YEAR([Dates]) AS varchar(4))
ELSE CASE
WHEN DATEPART(m, [Dates]) <= 9 THEN 'Q3 ' + CAST(YEAR([Dates]) AS varchar(4))
ELSE CASE
WHEN DATEPART(m, [Dates]) <= 12 THEN 'Q4 ' + CAST(YEAR([Dates]) AS varchar(4))
ELSE ''
END
END
END
END AS 'Quarter',
CASE
WHEN DATEPART(m, [Dates]) <= 6 THEN 'HY1 ' + CAST(YEAR([Dates]) AS varchar(4))
ELSE CASE
WHEN DATEPART(m, [Dates]) <= 12 THEN 'HY2 ' + CAST(YEAR([Dates]) AS varchar(4))
ELSE ''
END
END AS 'HalfYear',
YEAR([Dates]) AS 'Year',
CAST('1-' AS varchar(5)) + CAST(DATEPART(M, [Dates]) AS varchar(10)) + '-' + CAST(YEAR([Dates]) AS varchar(4)) AS DateName
FROM ctedaterange
GO
The main thing is that I need to wrap it inside my SQL Views. Any help to my problem will be appreciated.
Thanks,

Answer 1

You can move the aggregations to an extra cte, so this might be what you want:
ALTER VIEW [dbo].[CYExtraction]
(PK_Date, [Month], [Quarter], [HalfYear], [Year], [DateName])
AS
WITH cteAllItems (mindates, maxdates) AS (
SELECT MIN(CreatedOn), MAX(CreatedOn) FROM Items
UNION ALL
SELECT MIN(CreatedOn), MAX(CreatedOn) FROM Bibs
UNION ALL
SELECT MIN(CreatedOn), MAX(CreatedOn) FROM Porders
),
ctedaterange (Dates, MaxDate) AS (
SELECT MIN(mindates), MAX(maxdates)
FROM cteAllItems
UNION ALL
SELECT DATEADD(day, 1, Dates), MaxDate
FROM ctedaterange
WHERE DATEADD(day, 1, Dates) <= MaxDate
)
SELECT
Dates AS PK_Date,
DATENAME(MONTH, Dates) + N' ' + DATENAME(YEAR, Dates),
N'Q' + DATENAME(QUARTER, Dates) + N' ' + DATENAME(YEAR, Dates),
N'HY' + CAST((MONTH(Dates)-1)/6+1 AS nvarchar(1)) + N' ' + DATENAME(YEAR, Dates),
YEAR(Dates),
CONVERT(nvarchar(10), DATEADD(MONTH, DATEDIFF(MONTH, 0, Dates), 0), 105)
FROM ctedaterange
GO