split from date and To date in multiple months using oracle sql - sql

Question

In need to split lines with From date and To date in multiple months.
I want to split like this.Target
Sample 1
10/02/2023 - 28/02/2023
Target
10/02/2023 - 28/02/2023
Sample 2
10/02/2023 - 29/08/2023
Target
10/02/2023 - 28/02/2023
01/03/2023 - 31/03/2023
01/04/2023 - 29/08/2023
Sample 3
01/04/2022 - 31/03/2023
Target
01/04/2022 - 28/02/2023
01/03/2023 - 31/03/2023
I succeed in first steps but I'm now stucked
For the moment I can only do like this[Existing]
But in yellow wrong values,
Here below my code
CASE WHEN qd.valid_from >= TRUNC(add_months(qd.valid_from,COLUMN_VALUE - 1),'MM')
THEN
TRUNC(qd.valid_from)
ELSE
TRUNC(add_months(qd.valid_from,COLUMN_VALUE - 1),'MM')
END new_start_date,
CASE WHEN last_day(TRUNC(add_months(qd.valid_from,COLUMN_VALUE - 1),'MM')) >= last_day(TRUNC(add_months(qd.valid_from,2),'MM'))
THEN
TRUNC(qd.valid_to)
ELSE
TRUNC(last_day(TRUNC(add_months(qd.valid_from,COLUMN_VALUE - 1),'MM')))
END new_end_date
FROM QUOTATIONS_UO QH
),
TABLE(
CAST(
MULTISET
(
SELECT LEVEL
FROM dual
CONNECT BY add_months(TRUNC(qd.valid_from,'MM'),LEVEL - 1) <= add_months(TRUNC(qd.valid_from,'MM'),2)
) AS sys.OdciNumberList
)
)
)

Answer 1

It is unclear what is it about months february and march vs all the others, but if you want to split dates by months then maybe this could help you:
Select DISTINCT
ID,
LEVEL "LVL",
CASE WHEN LEVEL = 1 THEN FROM_DATE END "FROM_DATE",
CASE WHEN LEVEL = 1 THEN UNTIL_DATE END "UNTIL_DATE",
CASE WHEN MONTH_UNTIL = MONTH_FROM THEN FROM_DATE
WHEN LEVEL = 1 THEN FROM_DATE
WHEN MONTHS > 1 And LEVEL < MONTHS THEN LAST_DAY(ADD_MONTHS(FROM_DATE, LEVEL - 2)) + 1
WHEN MONTHS > 1 And LEVEL = MONTHS THEN LAST_DAY(ADD_MONTHS(FROM_DATE, LEVEL - 2)) + 1
WHEN MONTHS > 0 And MONTHS < LEVEL THEN LAST_DAY(ADD_MONTHS(FROM_DATE, LEVEL - 2)) + 1
ELSE UNTIL_DATE
END "FROM_DATE_2",
--
CASE WHEN MONTH_UNTIL = MONTH_FROM THEN UNTIL_DATE
--WHEN LEVEL = 1 THEN LAST_DAY(ADD_MONTHS(FROM_DATE, LEVEL - 1))
WHEN MONTHS > 1 And LEVEL < MONTHS THEN LAST_DAY(ADD_MONTHS(FROM_DATE, LEVEL - 1))
WHEN MONTHS > 1 And LEVEL = MONTHS THEN LAST_DAY(ADD_MONTHS(FROM_DATE, LEVEL - 1))
ELSE UNTIL_DATE
END "UNTIL_DATE_2"
FROM
(
Select
ID, FROM_DATE, UNTIL_DATE,
To_Char(FROM_DATE, 'yyyymm') "MONTH_FROM",
To_Char(UNTIL_DATE, 'yyyymm') "MONTH_UNTIL",
FLOOR(MONTHS_BETWEEN(UNTIL_DATE, FROM_DATE)) "MONTHS"
From
tbl
)
CONNECT BY LEVEL < MONTHS + 2
ORDER BY ID, LVL
... which with sample data like here:
WITH
tbl (ID, FROM_DATE, UNTIL_DATE) AS
(
Select 1, To_Date('10.02.2023', 'dd.mm.yyyy'), To_Date('28.02.2023', 'dd.mm.yyyy') From Dual Union All
Select 2, To_Date('10.02.2023', 'dd.mm.yyyy'), To_Date('29.08.2023', 'dd.mm.yyyy') From Dual Union All
Select 3, To_Date('01.04.2022', 'dd.mm.yyyy'), To_Date('31.03.2023', 'dd.mm.yyyy') From Dual
)
... results as:
ID LVL FROM_DATE UNTIL_DATE FROM_DATE_2 UNTIL_DATE_2
---------- ---------- --------- ---------- ----------- ------------
1 1 10-FEB-23 28-FEB-23 10-FEB-23 28-FEB-23
2 1 10-FEB-23 29-AUG-23 10-FEB-23 28-FEB-23
2 2 01-MAR-23 31-MAR-23
2 3 01-APR-23 30-APR-23
2 4 01-MAY-23 31-MAY-23
2 5 01-JUN-23 30-JUN-23
2 6 01-JUL-23 31-JUL-23
2 7 01-AUG-23 29-AUG-23
3 1 01-APR-22 31-MAR-23 01-APR-22 30-APR-22
3 2 01-MAY-22 31-MAY-22
3 3 01-JUN-22 30-JUN-22
3 4 01-JUL-22 31-JUL-22
3 5 01-AUG-22 31-AUG-22
3 6 01-SEP-22 30-SEP-22
3 7 01-OCT-22 31-OCT-22
3 8 01-NOV-22 30-NOV-22
3 9 01-DEC-22 31-DEC-22
3 10 01-JAN-23 31-JAN-23
3 11 01-FEB-23 28-FEB-23
3 12 01-MAR-23 31-MAR-23