JOIN (VALUES (0),(1),(2),(3),...... ON Logic - sql-server

Question

SQL-SERVER 2017
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DB-CODE:
CREATE TABLE [TABLE_1] (
PLAN_NR decimal(28,6) NULL,
START_DATE datetime NULL);
INSERT INTO TABLE_1
(PLAN_NR,START_DATE)
VALUES
(1,'2020-05-01'),
(2,'2020-08-01');
My question is about the Syntax of the following Select:
WITH Dates AS(
SELECT T1.PLAN_NR,
V.I+1 AS PERIOD_NR,
DATEADD(DAY, 7*V.I, T1.START_DATE) AS START_DATE,
LEAD(DATEADD(DAY, 7*V.I, T1.START_DATE)) OVER (PARTITION BY PLAN_NR ORDER BY V.I) AS END_DATE
FROM dbo.TABLE_1 T1
------------------------------------------------
--> JOIN (VALUES(0),(1),(2),(3),(4),(5),(6),(7),(8),(9),(10)) V(I) ON 1000 >= V.I) <-- THIS LINE
------------------------------------------------
SELECT D.PLAN_NR,
D.PERIOD_NR,
V.START_DATE
FROM Dates D
CROSS APPLY (VALUES(START_DATE),(CASE WHEN MONTH(START_DATE) != MONTH(END_DATE) THEN
DATEADD(MONTH,DATEDIFF(MONTH,0,END_DATE),0) END)) V(START_DATE)
WHERE V.START_DATE IS NOT NULL
What is the logic to extend the values here to e.g. 1000?
Do I have to write out VALUES(0),(1),(2),(3),(4),(5),(6),(7),(8),(9),(10)......(1000)?
Edit:
I got the code mentioned here from Larnu answer to another question:
here.

Answer 1

I would create an extended tally:
WITH N AS(
SELECT N
FROM (VALUES(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL))N(N)),
Tally AS
(SELECT 0 AS I
UNION ALL
SELECT ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) AS I
FROM N N1,
N N2,
N N3),
Dates AS
(SELECT T1.PLAN_NR,
T.I + 1 AS PERIOD_NR,
DATEADD(DAY, 7 * T.I, T1.START_DATE) AS START_DATE,
LEAD(DATEADD(DAY, 7 * T.I, T1.START_DATE)) OVER (PARTITION BY PLAN_NR ORDER BY T.I) AS END_DATE
FROM dbo.TABLE_1 T1
CROSS JOIN Tally T)
SELECT D.PLAN_NR,
D.PERIOD_NR,
V.START_DATE
FROM Dates D
CROSS APPLY (VALUES (START_DATE),
(CASE
WHEN MONTH(START_DATE) != MONTH(END_DATE) THEN DATEADD(MONTH, DATEDIFF(MONTH, 0, END_DATE), 0)
END)) V (START_DATE)
WHERE V.START_DATE IS NOT NULL;

Answer 2

You don't need, you can have a CTE to generate the number and join in like following.
WITH cteNum
AS (
SELECT 1 AS I
UNION ALL
SELECT I + 1
FROM cteNum
WHERE I + 1 <= 1000
)
Your final query will look like
with cteNum as
(
select 1 as I
union all
select I +1 from cteNum
where I + 1<=1000
), Dates AS(
SELECT T1.PLAN_NR,
V.I+1 AS PERIOD_NR,
DATEADD(DAY, 7*V.I, T1.START_DATE) AS START_DATE,
LEAD(DATEADD(DAY, 7*V.I, T1.START_DATE)) OVER (PARTITION BY PLAN_NR ORDER BY V.I) AS END_DATE
FROM dbo.TABLE_1 T1
JOIN cteNum V ON 1000 >= V.I)
SELECT D.PLAN_NR,
D.PERIOD_NR,
V.START_DATE
FROM Dates D
CROSS APPLY (VALUES(START_DATE),(CASE WHEN MONTH(START_DATE) != MONTH(END_DATE) THEN DATEADD(MONTH,DATEDIFF(MONTH,0,END_DATE),0) END)) V(START_DATE)
WHERE V.START_DATE IS NOT NULL
option (maxrecursion 0)
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