SQL increment date using recursion - mysql

Question

I have a table which contains the following structure:
|-----------|------------|-----------|
| Number | Date | Subject |
|-----------|------------|-----------|
| 1 | 2015-01-01 | ABC |
| 2 | 2015-01-01 | ABC |
| 3 | 2015-01-01 | ABC |
| 4 | 2015-01-01 | ABC |
|-----------|------------|-----------|
I need to loop through the table and increment of n days each date.
So, assuming n = 10 I should get this result:
|-----------|------------|-----------|
| Number | Date | Subject |
|-----------|------------|-----------|
| 1 | 2015-01-01 | ABC |
| 2 | 2015-01-11 | ABC |
| 3 | 2015-01-21 | ABC |
| 4 | 2015-01-31 | ABC |
|-----------|------------|-----------|
The problem is a bit more complicated because n is generated by using a function which needs the previous generated date
I am trying to use CTE to accomplish this with the following CTE, but I get too many rows than expected.
WITH myCte(Number, Date, Subject)
AS
(
SELECT * FROM MyTable
UNION ALL
SELECT
Number, dbo.get_next_date(Date)
FROM MyCte
)
SELECT * FROM MyCte

Answer 1

That is because you have no WHERE clause in the recursive CTE. This would cause the query to stop when MAXRECURSION value is reached (default 100).
Here is an example to set a limit with a WHERE clause
DECLARE #MyTable TABLE
(
Number int,
Dt Date,
Sub CHAR(3)
)
INSERT INTO #MyTable
VALUES
(1,'2015-01-01','ABC'),
(2,'2015-01-11','ABC'),
(3,'2015-01-21','ABC'),
(4,'2015-01-31','ABC')
;WITH myCte(Number, Date, Subject)
AS
(
SELECT * FROM #MyTable
UNION ALL
SELECT
Number, DATEADD(day, 10, Date),Subject
FROM MyCte
WHERE Date < GETDATE()
)
SELECT * FROM MyCte
EDIT - If you know the number of rows, then you could just use TOP and get those rows.
SELECT TOP 4 * FROM MyCte