Getting duplicate dates while repeating the rows - sql

Question

I'm trying to rotate or repeat the sfhitId(1,2) between the date range for each employee.
Everything is working fine but I don't know how to stop getting duplicate dates means why I am getting dublicate dates and how can I rid from it...
Can anyone help me with this?
My only requirement is if any employeeid has 1 or more than 1 shift then shiftId should repeat between given date range for each employee.
DECLARE #TempTable TABLE (EmployeeId int, ShiftId int)
INSERT INTO #TempTable
SELECT 1 , 1
UNION ALL
SELECT 1, 3
UNION ALL
SELECT 2, 3
DECLARE #StartDate datetime = '2020-03-05',
#EndDate datetime = '2020-03-09';
WITH theDates AS
(
SELECT #StartDate AS theDate
UNION ALL
SELECT DATEADD(DAY, 1, theDate)
FROM theDates
WHERE DATEADD(DAY, 1, theDate) <= #EndDate
)
SELECT theDate, EmployeeID, SHiftId
FROM theDates
CROSS APPLY #TempTable
ORDER BY EmployeeId, theDate
OPTION (MAXRECURSION 0);
and I want result like this...
theDate EmployeeID SHiftId
2020-03-05 1 1
2020-03-06 1 3
2020-03-07 1 1
2020-03-08 1 3
2020-03-09 1 1
2020-03-05 2 3
2020-03-06 2 3
2020-03-07 2 3
2020-03-08 2 3
2020-03-09 2 3

Answer 1

Use window functions to join the 2 tables:
DECLARE #TempTable TABLE (EmployeeId int, ShiftId int)
INSERT INTO #TempTable
SELECT 1 , 1
UNION ALL
SELECT 1, 3
UNION ALL
SELECT 2, 3
DECLARE #StartDate datetime = '2020-03-05',
#EndDate datetime = '2020-03-09';
WITH
theDates AS (
SELECT 1 rn, #StartDate AS theDate
UNION ALL
SELECT rn + 1, DATEADD(DAY, 1, theDate)
FROM theDates
WHERE DATEADD(DAY, 1, theDate) <= #EndDate
),
theShifts AS (
SELECT *,
ROW_NUMBER() OVER (PARTITION BY EmployeeId ORDER BY ShiftId) rn,
COUNT(*) OVER (PARTITION BY EmployeeId) counter
FROM #TempTable
)
SELECT d.theDate, s.EmployeeID, s.ShiftId
FROM theDates d INNER JOIN theShifts s
ON s.rn % s.counter = d.rn % s.counter
ORDER BY s.EmployeeId, d.theDate
OPTION (MAXRECURSION 0);
See the demo.
Results:
> theDate | EmployeeID | ShiftId
> :---------------------- | ---------: | ------:
> 2020-03-05 00:00:00.000 | 1 | 1
> 2020-03-06 00:00:00.000 | 1 | 3
> 2020-03-07 00:00:00.000 | 1 | 1
> 2020-03-08 00:00:00.000 | 1 | 3
> 2020-03-09 00:00:00.000 | 1 | 1
> 2020-03-05 00:00:00.000 | 2 | 3
> 2020-03-06 00:00:00.000 | 2 | 3
> 2020-03-07 00:00:00.000 | 2 | 3
> 2020-03-08 00:00:00.000 | 2 | 3
> 2020-03-09 00:00:00.000 | 2 | 3