Split a record to multiple rows of record - sql

Question

I have table as below
Master Table
ID Name
1 Bubble
Child Table
ID MasterTableID StartDate EndDate Qty UnitMeasurement
1 1 1/2/2019 1/6/2019 1000 sqft
2 1 1/2/2019 1/4/2019 3000 sqft
I need to select the record above and show it in 5 rows since 1/2 - 1/6 were 5 months.
Date Qty
1/2/2019 200
1/3/2019 200
1/4/2019 200
1/5/2019 200
1/6/2019 200
Second row record to 3 rows record
Date Qty
1/2/2019 1000
1/3/2019 1000
1/4/2019 1000
I'm using SQL Server.
May I know it is possible to do so?

Answer 1

you can use Recursively + CTE and filter using inner join on id
CREATE TABLE T
([ID] int, [MasterTableID] int, [StartDate] datetime, [EndDate] datetime, [Qty] int, [UnitMeasurement] varchar(4))
;
INSERT INTO T
([ID], [MasterTableID], [StartDate], [EndDate], [Qty], [UnitMeasurement])
VALUES
(1, 1, '2019-01-02 00:00:00', '2019-01-06 00:00:00', 1000, 'sqft'),
(2, 1, '2019-01-02 00:00:00', '2019-01-04 00:00:00', 3000, 'sqft')
;
GO
2 rows affected
with cte as (
select [EndDate] as [Date],ID,datediff(day,[StartDate], [EndDate]) diff , [Qty] / (datediff(day,[StartDate], [EndDate]) + 1) as qty
from T
union all
select dateadd(day,-1,[Date]) [Date],T1.ID,T2.diff - 1 as diff,T2.qty
from T T1
inner join cte T2 on T1.ID = T2.ID
where diff >0
)
select ID,[Date],qty
from cte
order by ID,[Date]
GO
ID | Date | qty
-: | :------------------ | ---:
1 | 02/01/2019 00:00:00 | 200
1 | 03/01/2019 00:00:00 | 200
1 | 04/01/2019 00:00:00 | 200
1 | 05/01/2019 00:00:00 | 200
1 | 06/01/2019 00:00:00 | 200
2 | 02/01/2019 00:00:00 | 1000
2 | 03/01/2019 00:00:00 | 1000
2 | 04/01/2019 00:00:00 | 1000
db<>fiddle here

Answer 2

This is achievable using cte. since your dateformat is ddMMyyy, we need to convert this to MMddyyy so we can use dateadd(month...
CREATE TABLE #Temp
(id int, [StartDate] varchar(30), [EndDate] varchar(30), [Qty] int, [UnitMeasurement] varchar(4))
;
INSERT INTO #Temp
(id, [StartDate], [EndDate], [Qty], [UnitMeasurement])
VALUES
(1, '1/2/2019', '1/6/2019', 1000, 'sqft'),
(2, '1/2/2019', '1/4/2019', 3000, 'sqft')
;
GO
with cte as
(
Select id, cast(convert(varchar
, convert(datetime, [StartDate], 103), 101) as date) as startdate
, cast(convert(varchar
, convert(datetime, [EndDate], 103), 101) as date) as enddate
, [Qty]
, 1 as ctr from #Temp
union all
Select id, dateadd(month, 1, startdate), enddate, qty, ctr + 1
From cte
Where startdate < enddate
)
Select t1.id, qty/t2.ct, startdate from cte t1
cross apply (select count(1) ct, id from cte group by id) t2
where t2.id = t1.id
order by t1.id asc
Option (MaxRecursion 0)
drop table #Temp
output:

Answer 3

try like below for generating date
DECLARE #StartDate DATE = '1/2/2019'
, #EndDate DATE = '1/6/2019'
SELECT DATEADD(DAY, nbr - 1, #StartDate)
FROM ( SELECT ROW_NUMBER() OVER ( ORDER BY c.object_id ) AS Nbr
FROM sys.columns c
) nbrs
WHERE nbr - 1 <= DATEDIFF(DAY, #StartDate, #EndDate)
or you can use recursion
Declare #FromDate Date = '1/2/2019',
#ToDate Date = '1/6/2019'
;With DateCte (Date) As
(
Select #FromDate Union All
Select DateAdd(Day, 1, Date)
From DateCte
Where Date <= #ToDate
)
Select Date
From DateCte
Option (MaxRecursion 0)