MS SQL: alter indexed view by including additional columns from new table - sql

Question

I need to update existing MS SQL indexed view by including additional columns values from newly created table.
Indexed view:
CREATE OR ALTER VIEW [dbo].[MySelectionInfo]
WITH schemabinding
AS
SELECT C.Id id0,
C.Code Code1,
C.Name Name2,
C.ProgramLevel Level3,
C.Department Department4,
C.City City10,
C.STATE State11,
C.StartDate StartDate12,
C.Deadline Deadline13,
B.ID Table_B_ID,
A.Id Table_A_ID
FROM dbo.Table_A A
INNER JOIN dbo.Table_B B ON A.id = B.Table_A_Id
INNER JOIN dbo.Table_C C ON C.Table_B_Id = B.Id
New table:
CREATE TABLE [dbo].[Table_D] (
[Id] [int] IDENTITY (1, 1) PRIMARY KEY NOT NULL,
[ModelName] [varchar](max) NOT NULL,
[Table_C_Id] [int] NOT NULL,
[AttributeValue] [varchar](max) NOT NULL,
[CreatedDate] [datetime] NOT NULL,
[UpdatedDate] [datetime] NOT NULL,
CONSTRAINT FK_Table_C_Id FOREIGN KEY (Table_C_Id) REFERENCES some_schema.dbo.[Table_C] (Id)
ON DELETE CASCADE
ON UPDATE CASCADE
)
Data in the new table:
I want to include only some of the ModelName column values as a column names and AttributeValue as values in the select * from [dbo].[MySelectionInfo] result set:
I can achieve the desired result using the PIVOT function:
CREATE OR ALTER VIEW [dbo].[MySelectionInfo]
WITH schemabinding
AS
SELECT C.Id id0,
C.Code Code1,
C.Name Name2,
C.StartDate StartDate12,
C.Deadline Deadline13,
B.ID Table_B_ID,
A.Id Table_A_ID
FROM dbo.Table_A A
INNER JOIN dbo.Table_B B ON A.id = B.Table_A_Id
INNER JOIN dbo.Table_C C ON C.Table_B_Id = B.Id
LEFT JOIN (SELECT PivotTable.Table_C_Id,
PivotTable.attribute1,
PivotTable.attribute2,
PivotTable.attribute3
FROM (SELECT Table_D.Table_C_Id,
Table_D.ModelName,
Table_D.AttributeValue
FROM dbo.Table_C
INNER JOIN dbo.Table_D
ON Table_C.Id = Table_D.Table_C_Id) AS sourceTable
PIVOT (
Max(AttributeValue) FOR ModelName IN (attribute1, attribute2, attribute3)
) AS PivotTable) dbo.Table_D D ON D.Table_C_Id = C.Id
But, after running the SQL statement above, I am not be able to create the clustered index for the view, because LEFT JOIN, PIVOT, MAX are prohibited to be used in the indexed views.
Question: Is there any other solutions to achieve the desired result and still have an existing view as an Indexed view?

Answer 1

if your data allow it, you could cross tab with case statements instead of PIVOTing:
/*
drop view dbo.mytestinfoview;
go
drop table dbo.Table1;
go
--*/
create table dbo.Table1
(
id int,
ModelName varchar(20),
AttributeValue int
);
insert into dbo.Table1(id, ModelName, AttributeValue)
select distinct o.object_id, concat('attribute', v.id), o.attributevalue
from
(
select
object_id ,
abs(checksum(newid())) % 2 as attributevalue
from sys.objects
) as o
cross apply (values(1), (2), (3), (4)) as v(id)
go
create or alter view dbo.mytestinfoview
with schemabinding
as
select id, count_big(*) as thecounter,
sum(isnull(case ModelName when 'attribute1' then AttributeValue end, 0)) as attribute1,
sum(isnull(case ModelName when 'attribute2' then AttributeValue else 0 end, 0)) as attribute2,
sum(isnull(case ModelName when 'attribute3' then AttributeValue else 0 end, 0)) as attribute3
from dbo.Table1
group by id
go
create unique clustered index idx_v1 on dbo.mytestinfoview(id);
go
select * from dbo.mytestinfoview;
go