I have one doubt in sql server get records based on installments Table :productdetails
CREATE TABLE [dbo].[productdetails](
[productid] [int] NULL,
[Productrstartdate] [date] NULL,
[Productenddate] [date] NULL,
[EMIInstallment] [int] NULL
) ON [PRIMARY]
GO
INSERT [dbo].[productdetails] ([productid], [Productrstartdate], [Productenddate], [EMIInstallment]) VALUES (1, CAST(N'2020-10-02' AS Date), CAST(N'2024-10-02' AS Date), 5)
GO
INSERT [dbo].[productdetails] ([productid], [Productrstartdate], [Productenddate], [EMIInstallment]) VALUES (2, CAST(N'2020-02-10' AS Date), CAST(N'2021-02-10' AS Date), 2)
GO
INSERT [dbo].[productdetails] ([productid], [Productrstartdate], [Productenddate], [EMIInstallment]) VALUES (3, CAST(N'2019-01-10' AS Date), CAST(N'2019-01-10' AS Date), 1)
GO
INSERT [dbo].[productdetails] ([productid], [Productrstartdate], [Productenddate], [EMIInstallment]) VALUES (4, CAST(N'2019-01-18' AS Date), CAST(N'2021-01-18' AS Date), 3)
GO
based on above data i want output like below
Productid |Installmentdate |noofinstallmentcount
1 |2020-10-02 |1
1 |2021-10-02 |2
1 |2022-10-02 |3
1 |2023-10-02 |4
1 |2024-10-02 |5
2 |2020-02-10 |1
2 |2021-02-10 |2
3 |2019-01-10 |1
4 |2019-01-18 |1
4 |2020-01-18 |2
4 |2021-01-18 |3
i tried like below :
;WITH ABC
AS
(
SELECT productid ,[Productrstartdate] CalendarDate ,[Productenddate],
1 as lvl from [dbo].[productdetails]
UNION ALL
SELECT a.productid ,DATEADD(YEAR,1,b.CalendarDate ) CalendarDate, b.[Productenddate], lvl + 1
FROM [dbo].[productdetails] a join ABC b on a.productid=b.productid
WHERE b.CalendarDate <a.[Productenddate]
)
SELECT productid, CalendarDate, lvl as noofinstallmentcount
FROM ABC
order by productid
above query is giving expected result,but query execution taking more time.
here i give sample records ,in orginal table 200 core records.cte is occupy 100% ram memory utilization consequences of storiing milion records in cte.
can you pleaese me how to write alernative solution with out using cte in sql server