I want to create a view with result like this in SQL Server,
from data table with date range per row (start date – end date), can generate repeating data based on a date range to get the number of months for repeating data (by displaying the date of the beginning of each month).
data table
| name | Debt | Start Date | End Date |
|---|---|---|---|
| A | 100 | 2022-01-24 | 2022-03-31 |
| B | 50 | 2022-01-17 | 2022-02-28 |
| C | 80 | 2023-02-06 | 2023-02-28 |
result view
| name | Debt | Checkpoint Date | End Date |
|---|---|---|---|
| A | 100 | 2023-01-01 | 2022-03-31 |
| A | 100 | 2023-02-01 | 2022-03-31 |
| A | 100 | 2023-03-01 | 2022-03-31 |
| B | 50 | 2023-01-01 | 2022-02-28 |
| B | 50 | 2023-02-01 | 2022-02-28 |
| C | 80 | 2023-02-01 | 2023-02-28 |
Can it be creating using View without creating a function?
>Solution :
I would approach this using a recursive CTE:
WITH cte AS (
SELECT name, debt, DATETRUNC(month, start_date) AS start_date, end_date
FROM mytable
UNION ALL
SELECT m.name, m.debt, DATEADD(month, 1, c.start_date), m.end_date
FROM mytable m
JOIN cte c ON c.name = m.name
AND DATEADD(month,1,c.start_date) < m.end_date
)
SELECT *
FROM cte
ORDER BY name, start_date;
Results :
name debt start_date end_date
A 100 2022-01-01 2022-03-31
A 100 2022-02-01 2022-03-31
A 100 2022-03-01 2022-03-31
B 50 2022-01-01 2022-02-28
B 50 2022-02-01 2022-02-28
C 80 2023-02-01 2023-02-28