Dynamic pivot and initialization with a constant (without sum) - sql-server

Question

I have two Tables: TbOrder and TbProduct. These tables are correlated by a condition on a number progression through the '&' operator. If the condition is true I should assign the product to the relative order.
CREATE TABLE [dbo].[TbOrder](
[Id] [bigint] NOT NULL,
[Flag] [bigint] NOT NULL,
CONSTRAINT [PK_TbOrder] PRIMARY KEY CLUSTERED
(
[Id] 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
CREATE TABLE [dbo].[TbProduct](
[Id] [bigint] NOT NULL,
[Flag] [bigint] NOT NULL,
[Name] [varchar](50) NOT NULL,
CONSTRAINT [PK_TbProduct] PRIMARY KEY CLUSTERED
(
[Id] 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
INSERT [dbo].[TbOrder] ([Id], [Flag]) VALUES (1, 5124)
INSERT [dbo].[TbOrder] ([Id], [Flag]) VALUES (2, 10507925)
INSERT [dbo].[TbOrder] ([Id], [Flag]) VALUES (3, 10053569)
INSERT [dbo].[TbProduct] ([Id], [Flag], [Name]) VALUES (1, 4, N'Prod1')
INSERT [dbo].[TbProduct] ([Id], [Flag], [Name]) VALUES (2, 1024, N'Prod2')
INSERT [dbo].[TbProduct] ([Id], [Flag], [Name]) VALUES (3, 4096, N'Prod3')
INSERT [dbo].[TbProduct] ([Id], [Flag], [Name]) VALUES (4, 2, N'Prod4')
INSERT [dbo].[TbProduct] ([Id], [Flag], [Name]) VALUES (5, 1, N'Prod5')
INSERT [dbo].[TbProduct] ([Id], [Flag], [Name]) VALUES (6, 8, N'Prod6')
INSERT [dbo].[TbProduct] ([Id], [Flag], [Name]) VALUES (7, 512, N'Prod7')
INSERT [dbo].[TbProduct] ([Id], [Flag], [Name]) VALUES (8, 32, N'Prod8')
INSERT [dbo].[TbProduct] ([Id], [Flag], [Name]) VALUES (9, 16, N'Prod9')
INSERT [dbo].[TbProduct] ([Id], [Flag], [Name]) VALUES (10, 128, N'Prod10')
INSERT [dbo].[TbProduct] ([Id], [Flag], [Name]) VALUES (11, 64, N'Prod11')
INSERT [dbo].[TbProduct] ([Id], [Flag], [Name]) VALUES (12, 1, N'Prod12')
INSERT [dbo].[TbProduct] ([Id], [Flag], [Name]) VALUES (13, 8192, N'Prod13')
INSERT [dbo].[TbProduct] ([Id], [Flag], [Name]) VALUES (14, 16384, N'Prod14')
The query and the result are as follow:
select o.Id OrderId, o.Flag OrderFlag, p.Id ProductId,
p.Flag ProductFlag, p.Name ProductName from TbOrder o
inner join TbProduct p on (o.Flag & p.Flag)=p.Flag
I tried with Pivot but the result compared to the first query remained unchanged (removing the line --'x').
select * from
(select o.Id OrderId, o.Flag OrderFlag, p.Id ProductId, p.Flag ProductFlag, p.Name ProductName from TbOrder o
inner join TbProduct p on (o.Flag & p.Flag)=p.Flag) t
DECLARE #cols AS NVARCHAR(MAX),
#query AS NVARCHAR(MAX)
select #cols += QUOTENAME(Name) + ','
FROM TbProduct
ORDER BY FLAG;
SET #cols = LEFT(#cols, LEN(#cols) - 1);
print #cols;
SELECT #query = '
SELECT t.* FROM t
PIVOT
(
--'x'
FOR t.Name IN( ' + #cols + ' )
) AS pivot_table; ';
execute(#query)
What I would like obtain instead is a single row for each order and only the product name for which the condition is true (marked with an 'x' in the order row) are columns.
I thank in advance anyone who tries to solve this.

Answer 1

Using your transform query, you found out allProducts and allOrders. Then you can generate all combinations using CROSS JOIN.
Now you try to match each combination with the data already on transfrom, for every match you assign X.
Now with that data you can do a DINAMIC PIVOT. I skip because looks like you know how to do it.
SQL DEMO
WITH transform as (
select o.Id OrderId, o.Flag OrderFlag, p.Id ProductId,
p.Flag ProductFlag, p.Name ProductName
from TbOrder o
inner join TbProduct p
on (o.Flag & p.Flag) = p.Flag
), allProducts as (
SELECT distinct ProductName
FROM transform
), allOrders as (
SELECT distinct OrderFlag
FROM transform
)
SELECT O.OrderFlag,
P.ProductName,
CASE WHEN T.ProductName IS NOT NULL
THEN 'X'
END as flag
INTO partial_result
FROM allProducts P
CROSS JOIN allOrders O
LEFT JOIN transform T
ON O.OrderFlag = T.OrderFlag
AND P.ProductName= T.ProductName;
DECLARE #cols AS NVARCHAR(MAX),
#query AS NVARCHAR(MAX);
SET #cols = STUFF((SELECT distinct ',' + QUOTENAME(c.ProductName)
FROM partial_result c
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
SET #query = 'SELECT OrderFlag, ' + #cols + ' from
(
select OrderFlag
, ProductName
, flag
from partial_result
) x
pivot
(
max(flag)
for ProductName in (' + #cols + ')
) p ';
execute(#query);
OUTPUT