Sum duplicated rows in SQL Server - sql-server

Question

Sum repeated values in datatable (VB.NET) or in SQL Server (are better one or other solutions)
I have a database in which are reported repeated rows:
Description | Price | Q.ty | Tax
AAAAAAAAAAA | 10.00 | 20.0 | 5
AAAAAAAAAAA | 10.00 | 12.0 | 5
BBBBBBBBBBB | 18.00 | 09.0 | 5
BBBBBBBBBBB | 18.00 | 12.0 | 5
CCCCCCCCCCC | 13.00 | 15.0 | 5
AAAAAAAAAAA | 17.0 | 19.0 | 5
And I want obtain something like this:
Description | Price | Q.ty | Tax
AAAAAAAAAAA | 10.00 | 51.0 | 5
BBBBBBBBBBB | 18.00 | 21.0 | 5
CCCCCCCCCCC | 13.00 | 15.0 | 5
I've created a datatable in VB.NET and I tried to sum values in it, and then show summed rows in a datagridview, but without results. Then, I've tried to do this with SQL Server (2019), without results again.
Can someone help me, please?
My code is:
Dim conn as New SqlConnection("*****")
Dim cmd2 As New SqlCommand("SELECT Description, Price, SUM(Q.ty), Tax, FROM Prodotti GROUP BY Descrizione", conn)
Dim da As New SqlDataAdapter
da.SelectCommand = cmd2
Dim dt As New DataTable
dt.Clear()
da.Fill(dt)
DataGridView1.SuspendLayout()
DataGridView1.DataSource = dt
DataGridView1.ResumeLayout()
conn.Close()
I want to obtain my goal with VB.NET or directly with SQL Server.

Answer 1

Given this table and data:
USE [Testing]
GO
/****** Object: Table [dbo].[SO71561140] Script Date: 26/03/2022 19:01:14 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[SO71561140](
[Description] [nchar](10) NOT NULL,
[Price] [decimal](19, 4) NOT NULL,
[Quantity] [decimal](19, 4) NOT NULL,
[Tax] [decimal](19, 4) NOT NULL
) ON [PRIMARY]
GO
INSERT [dbo].[SO71561140] ([Description], [Price], [Quantity], [Tax]) VALUES (N'A ', CAST(10 AS Decimal(19, 4)), CAST(20 AS Decimal(19, 4)), CAST(5 AS Decimal(19, 4)))
GO
INSERT [dbo].[SO71561140] ([Description], [Price], [Quantity], [Tax]) VALUES (N'A ', CAST(10 AS Decimal(19, 4)), CAST(12 AS Decimal(19, 4)), CAST(5 AS Decimal(19, 4)))
GO
INSERT [dbo].[SO71561140] ([Description], [Price], [Quantity], [Tax]) VALUES (N'B ', CAST(18 AS Decimal(19, 4)), CAST(9 AS Decimal(19, 4)), CAST(5 AS Decimal(19, 4)))
GO
INSERT [dbo].[SO71561140] ([Description], [Price], [Quantity], [Tax]) VALUES (N'B ', CAST(18 AS Decimal(19, 4)), CAST(12 AS Decimal(19, 4)), CAST(5 AS Decimal(19, 4)))
GO
INSERT [dbo].[SO71561140] ([Description], [Price], [Quantity], [Tax]) VALUES (N'C ', CAST(13 AS Decimal(19, 4)), CAST(15 AS Decimal(19, 4)), CAST(5 AS Decimal(19, 4)))
GO
INSERT [dbo].[SO71561140] ([Description], [Price], [Quantity], [Tax]) VALUES (N'A ', CAST(17 AS Decimal(19, 4)), CAST(19 AS Decimal(19, 4)), CAST(5 AS Decimal(19, 4)))
GO
and this small program:
Imports System.Data.SqlClient
Public Class Form1
Sub X()
Dim csb As New SqlConnectionStringBuilder() With {.DataSource = ".\SQLEXPRESS",
.InitialCatalog = "Testing",
.IntegratedSecurity = True}
Dim sql = "
SELECT [Description], SUM([Quantity]) AS 'Quantity', SUM([Quantity] * [Price]) AS 'Total Price', [Tax]
FROM SO71561140
GROUP BY [Description], [Tax]
"
Dim dt As New DataTable()
Using conn = New SqlConnection(csb.ConnectionString),
cmd = New SqlCommand(sql, conn),
da = New SqlDataAdapter(cmd)
da.Fill(dt)
End Using
DataGridView1.DataSource = dt
End Sub
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
X()
End Sub
End Class
I got this result:
You would need to include the tax rate in the total price per item to be able to remove the tax rate from the displayed data, but that may or may not be a good idea depending on what is needed by whoever pays the bills.