How to calculate Opening and Closing Balance in Transaction - sql

Question

I need to Calculate the Opening and closing Balance Transaction. I have Three Tables OB, Purchase, and Usage. The unique Key of all tables is Product id. I need a stored procedure for blow results. Based on the Product id selected need to calculate the opening and closing balance.
Table Structure: Below code contains Table and sample data
USE [BMC]
GO
/****** Object: Table [dbo].[TBLProductOB] Script Date: 08-07-2021 01:20:11 PM ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[TBLProductOB](
[Skey] [int] IDENTITY(1,1) NOT NULL,
[EntryDate] [date] NULL,
[Productid] [int] NULL,
[ProductOB] [decimal](12, 3) NULL,
CONSTRAINT [PK_TBLProductOB] PRIMARY KEY CLUSTERED
(
[Skey] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
/****** Object: Table [dbo].[TBLProductPurchase] Script Date: 08-07-2021 01:20:11 PM ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[TBLProductPurchase](
[Skey] [int] IDENTITY(1,1) NOT NULL,
[Entrydate] [date] NULL,
[Productid] [int] NULL,
[P_Purchase] [decimal](12, 3) NULL,
CONSTRAINT [PK_TBLProductPurchase] PRIMARY KEY CLUSTERED
(
[Skey] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
/****** Object: Table [dbo].[TBLProductUsage] Script Date: 08-07-2021 01:20:11 PM ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[TBLProductUsage](
[Skey] [int] IDENTITY(1,1) NOT NULL,
[Entrydate] [date] NULL,
[Productid] [int] NULL,
[P_Usage] [decimal](12, 3) NULL,
CONSTRAINT [PK_TBLProductUsage] PRIMARY KEY CLUSTERED
(
[Skey] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
SET IDENTITY_INSERT [dbo].[TBLProductOB] ON
INSERT [dbo].[TBLProductOB] ([Skey], [EntryDate], [Productid], [ProductOB]) VALUES (4, CAST(N'2021-04-01' AS Date), 3, CAST(100.000 AS Decimal(12, 3)))
INSERT [dbo].[TBLProductOB] ([Skey], [EntryDate], [Productid], [ProductOB]) VALUES (6, CAST(N'2021-04-01' AS Date), 1, CAST(10.000 AS Decimal(12, 3)))
INSERT [dbo].[TBLProductOB] ([Skey], [EntryDate], [Productid], [ProductOB]) VALUES (7, CAST(N'2021-04-01' AS Date), 2, CAST(150.000 AS Decimal(12, 3)))
SET IDENTITY_INSERT [dbo].[TBLProductOB] OFF
SET IDENTITY_INSERT [dbo].[TBLProductPurchase] ON
INSERT [dbo].[TBLProductPurchase] ([Skey], [Entrydate], [Productid], [P_Purchase]) VALUES (1, CAST(N'2021-07-06' AS Date), 3, CAST(100.000 AS Decimal(12, 3)))
INSERT [dbo].[TBLProductPurchase] ([Skey], [Entrydate], [Productid], [P_Purchase]) VALUES (7, CAST(N'2021-07-01' AS Date), 3, CAST(50.000 AS Decimal(12, 3)))
INSERT [dbo].[TBLProductPurchase] ([Skey], [Entrydate], [Productid], [P_Purchase]) VALUES (8, CAST(N'2021-07-15' AS Date), 3, CAST(50.000 AS Decimal(12, 3)))
INSERT [dbo].[TBLProductPurchase] ([Skey], [Entrydate], [Productid], [P_Purchase]) VALUES (9, CAST(N'2021-07-01' AS Date), 1, CAST(1.000 AS Decimal(12, 3)))
INSERT [dbo].[TBLProductPurchase] ([Skey], [Entrydate], [Productid], [P_Purchase]) VALUES (10, CAST(N'2021-07-03' AS Date), 1, CAST(1.000 AS Decimal(12, 3)))
INSERT [dbo].[TBLProductPurchase] ([Skey], [Entrydate], [Productid], [P_Purchase]) VALUES (11, CAST(N'2021-07-05' AS Date), 1, CAST(3.000 AS Decimal(12, 3)))
INSERT [dbo].[TBLProductPurchase] ([Skey], [Entrydate], [Productid], [P_Purchase]) VALUES (12, CAST(N'2021-07-01' AS Date), 2, CAST(10.000 AS Decimal(12, 3)))
INSERT [dbo].[TBLProductPurchase] ([Skey], [Entrydate], [Productid], [P_Purchase]) VALUES (13, CAST(N'2021-07-02' AS Date), 2, CAST(10.000 AS Decimal(12, 3)))
INSERT [dbo].[TBLProductPurchase] ([Skey], [Entrydate], [Productid], [P_Purchase]) VALUES (14, CAST(N'2021-07-05' AS Date), 2, CAST(10.000 AS Decimal(12, 3)))
INSERT [dbo].[TBLProductPurchase] ([Skey], [Entrydate], [Productid], [P_Purchase]) VALUES (15, CAST(N'2021-07-01' AS Date), 5, CAST(10.000 AS Decimal(12, 3)))
SET IDENTITY_INSERT [dbo].[TBLProductPurchase] OFF
SET IDENTITY_INSERT [dbo].[TBLProductUsage] ON
INSERT [dbo].[TBLProductUsage] ([Skey], [Entrydate], [Productid], [P_Usage]) VALUES (7, CAST(N'2021-07-01' AS Date), 3, CAST(10.000 AS Decimal(12, 3)))
INSERT [dbo].[TBLProductUsage] ([Skey], [Entrydate], [Productid], [P_Usage]) VALUES (8, CAST(N'2021-07-02' AS Date), 3, CAST(10.000 AS Decimal(12, 3)))
INSERT [dbo].[TBLProductUsage] ([Skey], [Entrydate], [Productid], [P_Usage]) VALUES (9, CAST(N'2021-07-08' AS Date), 3, CAST(10.000 AS Decimal(12, 3)))
INSERT [dbo].[TBLProductUsage] ([Skey], [Entrydate], [Productid], [P_Usage]) VALUES (10, CAST(N'2021-07-15' AS Date), 3, CAST(30.000 AS Decimal(12, 3)))
INSERT [dbo].[TBLProductUsage] ([Skey], [Entrydate], [Productid], [P_Usage]) VALUES (11, CAST(N'2021-07-01' AS Date), 2, CAST(2.000 AS Decimal(12, 3)))
INSERT [dbo].[TBLProductUsage] ([Skey], [Entrydate], [Productid], [P_Usage]) VALUES (12, CAST(N'2021-07-02' AS Date), 2, CAST(2.000 AS Decimal(12, 3)))
INSERT [dbo].[TBLProductUsage] ([Skey], [Entrydate], [Productid], [P_Usage]) VALUES (13, CAST(N'2021-07-03' AS Date), 2, CAST(2.000 AS Decimal(12, 3)))
INSERT [dbo].[TBLProductUsage] ([Skey], [Entrydate], [Productid], [P_Usage]) VALUES (14, CAST(N'2021-07-05' AS Date), 2, CAST(2.000 AS Decimal(12, 3)))
INSERT [dbo].[TBLProductUsage] ([Skey], [Entrydate], [Productid], [P_Usage]) VALUES (16, CAST(N'2021-07-01' AS Date), 1, CAST(2.000 AS Decimal(12, 3)))
INSERT [dbo].[TBLProductUsage] ([Skey], [Entrydate], [Productid], [P_Usage]) VALUES (17, CAST(N'2021-07-03' AS Date), 1, CAST(3.000 AS Decimal(12, 3)))
INSERT [dbo].[TBLProductUsage] ([Skey], [Entrydate], [Productid], [P_Usage]) VALUES (18, CAST(N'2021-07-04' AS Date), 2, CAST(2.000 AS Decimal(12, 3)))
SET IDENTITY_INSERT [dbo].[TBLProductUsage] OFF
Just tried: I don't know how to write a stored procedure for transaction-based. I was simply getting all the table results with the help of union.
Declare #1stOpeningBalance decimal(12,3)= (select ProductOB from TBLProductOB where Productid=2)
Select a.Entrydate,a.Productid,Lag(((Sum(a.Ob)+sum(a.Purchase))-sum(a.Usage)),1,#1stOpeningBalance) over (order by Entrydate asc) as Ob, sum(a.Purchase) as Purchase,(Sum(a.Ob)+sum(a.Purchase)) as Total, Sum(a.Usage) as Usage, ((Sum(a.Ob)+sum(a.Purchase))-sum(a.Usage)) as Cb from
(
select Entrydate,Productid,0 as Ob,Sum(Isnull(P_Purchase,0.000)) as Purchase,0 as Usage from TBLProductPurchase
group by EntryDate,Productid
union all
select Entrydate,Productid,0 as Ob,0 as Purchase,Sum(Isnull(P_Usage,0.000)) as Usage from TBLProductUsage
group by EntryDate,Productid
) as a
where Entrydate between '2021-07-01' and '2021-07-05' and Productid=2
group by a.EntryDate,a.Productid
Required Output Result:

Answer 1

You can use LEAD or LAG function to do this
Make sure you have only one record for the entry date. If you have multiple entries on the same date, you have to use a unique key to order
Assumption: you can calculate the closing balance and only opening balance needed to calcuate and need a system starting opening balance
Create table #temp_TBL(EntryDate date,Purchase decimal(18,2),total decimal(18,2),Usage decimal(18,2), CB decimal(18,2))
Declare #1stOpeningBalance decimal(18,2)=150
Insert into #temp_TBL (EntryDate,Purchase,total,Usage,CB)
values
('2021-07-01',10,160,2,158),
('2021-07-02',10,168,2,166),
('2021-07-03',0,166,2,164),
('2021-07-04',0,164,2,162),
('2021-07-05',10,172,2,170)
select EntryDate
,Lag(CB,1,#1stOpeningBalance) over (order by EntryDate ASC) as OB
,Purchase,total,Usage,CB from #temp_TBL
Output