Alternative to replace Union and subqueries to create Indexed view - sql-server

Question

When I go to run this query on SQL Server to create an indexed view, an error occurs to remove subqueries and Union
CREATE VIEW [dbo].[view_ToolGroup]
WITH SCHEMABINDING
AS
SELECT
toolGroup.ToolGroupId,toolGroupToTool.ToolId, toolGroupApp.AppId as TGAppId,
purposeToToolGroup.PurposeId as TGPurposeId, TGRole.RoleId as TGRoleId
FROM
[dbo].[toolGroup], [dbo].[purposeToTG], [dbo].[toolGroupToTool],
[dbo].[toolGroupToeApp] as toolGroupApp,
[dbo].[toolGroupToeAppToeRole] as toolGroupAppRole,
[dbo].[eRole] as TGRole
WHERE
toolGroup.ToolGroupId = purposeToToolGroup.ToolGroupId
and toolGroup.ToolGroupId = toolGroupToTool.ToolGroupId
and toolGroup.ToolGroupId = toolGroupApp.ToolGroupId
and toolGroupApp.toolGroupToeApplicationID=toolGroupAppRole.toolGroupToeApplicationID
and toolGroupAppRole.ToolgroupToeApplicationID in
(select ToolgroupToeApplicationID
from [dbo].[ToolgroupToeApplication])
and toolGroupAppRole.RoleId = TGRole.RoleId
UNION
SELECT
toolGroup.ToolGroupId, toolGroup.ToolGroupName,
null, null, null, null, null, null, null, null
FROM
[dbo].[toolGroup], [dbo].[toolGroupToeApplication]
WHERE
toolGroup.ToolGroupId = toolGroupToeApplication.ToolGroupId
and toolGroup.ToolGroupId not in
(select PurposeToToolGroup.ToolGroupId from [dbo].[PurposeToToolGroup])
and toolGroup.ToolGroupId in (select distinct ToolGroupId
from [dbo]. [toolGroupToeApplication] )'
GO
CREATE UNIQUE CLUSTERED INDEX IDX_view_ToolGroup
ON view_ToolGroup(ToolGroupId, ToolId, TGPurposeId, TGRoleId)
GO
Can anybody suggest an alternative solution to replace UNION and subqueries?

Answer 1

As per all the suggestion above, there is no direct way of doing this. However we can cheat. You could do the following
Break up the statements into two views
Add index to each view
Replace IN with INNER JOIN
User NOT IN while calling the views
As Damien suggested, it would be foolish of me to try and suggest or attempt to judge the logic at this time since we have no idea what the tables represent. I have however restructured the code as per the above which you could use as a template to structure your actual query.
Hope this helps
--Drop Index If Already Aresent
IF EXISTS (SELECT * FROM sys.views WHERE object_id = OBJECT_ID(N'[dbo].[vw_ToolGroup_One]'))
DROP VIEW dbo.vw_ToolGroup_One
GO
IF EXISTS (SELECT * FROM sys.views WHERE object_id = OBJECT_ID(N'[dbo].[vw_ToolGroup_Two]'))
DROP VIEW dbo.vw_ToolGroup_Two
GO
--Drop Dependant Tables
IF OBJECT_ID(N'toolGroup_tmp')>0
BEGIN
DROP TABLE toolGroup_tmp
END
CREATE TABLE toolGroup_tmp (ToolGroupId INT,ToolGroupName VARCHAR(100))
INSERT INTO toolGroup_tmp
SELECT 1,'ONE'
GO
IF OBJECT_ID(N'purposeToTG_tmp')>0
BEGIN
DROP TABLE purposeToTG_tmp
END
CREATE TABLE purposeToTG_tmp (ToolGroupId INT,PurposeId int)
INSERT INTO purposeToTG_tmp
SELECT 1,1
GO
IF OBJECT_ID(N'toolGroupToTool_tmp')>0
BEGIN
DROP TABLE toolGroupToTool_tmp
END
CREATE TABLE toolGroupToTool_tmp (ToolGroupId INT,ToolId INT)
INSERT INTO toolGroupToTool_tmp
SELECT 1,1
GO
IF OBJECT_ID(N'toolGroupToeApp_tmp')>0
BEGIN
DROP TABLE toolGroupToeApp_tmp
END
CREATE TABLE toolGroupToeApp_tmp (ToolGroupId INT,AppId INT,toolGroupToeApplicationID INT)
INSERT INTO toolGroupToeApp_tmp
SELECT 1,1,1
GO
IF OBJECT_ID(N'toolGroupToeAppToeRole_tmp')>0
BEGIN
DROP TABLE toolGroupToeAppToeRole_tmp
END
CREATE TABLE toolGroupToeAppToeRole_tmp (ToolGroupId INT,RoleId INT,toolGroupToeApplicationID INT)
INSERT INTO toolGroupToeAppToeRole_tmp
SELECT 1,1,1
GO
IF OBJECT_ID(N'ToolgroupToeApplication_tmp')>0
BEGIN
DROP TABLE ToolgroupToeApplication_tmp
END
CREATE TABLE ToolgroupToeApplication_tmp (ToolGroupId INT,ToolgroupToeApplicationID INT)
INSERT INTO ToolgroupToeApplication_tmp
SELECT 1,1
GO
IF OBJECT_ID(N'PurposeToToolGroup_tmp')>0
BEGIN
DROP TABLE PurposeToToolGroup_tmp
END
CREATE TABLE PurposeToToolGroup_tmp (ToolGroupId INT)
INSERT INTO PurposeToToolGroup_tmp
SELECT 1
GO
IF OBJECT_ID(N'eRole_tmp')>0
BEGIN
DROP TABLE eRole_tmp
END
CREATE TABLE eRole_tmp (RoleId INT)
INSERT INTO eRole_tmp
SELECT 1
GO
--Create Views
DECLARE #SQL NVARCHAR(MAX)
SET #SQL = '
CREATE VIEW dbo.vw_ToolGroup_One WITH SCHEMABINDING
AS
SELECT
tg.ToolGroupId,
tg.ToolGroupName,
tgtt.ToolId,
tga.AppId AS TGAppId,
pttg.PurposeId AS TGPurposeId,
tgr.RoleId AS TGRoleId
FROM dbo.toolGroup_tmp tg
INNER JOIN dbo.purposeToTG_tmp pttg
ON tg.ToolGroupId = pttg.ToolGroupId
INNER JOIN dbo.toolGroupToTool_tmp tgtt
ON tg.ToolGroupId = tgtt.ToolGroupId
INNER JOIN dbo.toolGroupToeApp_tmp tga
ON tg.ToolGroupId = tga.ToolGroupId
INNER JOIN dbo.toolGroupToeAppToeRole_tmp tgar
ON tga.toolGroupToeApplicationID = tgar.toolGroupToeApplicationID
INNER JOIN dbo.ToolgroupToeApplication_tmp tgta
ON tgta.ToolgroupToeApplicationID = tgar.ToolgroupToeApplicationID
INNER JOIN dbo.eRole_tmp tgr
ON tgar.RoleId = tgr.RoleId
'
EXEC SP_EXECUTESQL #SQL
SET #SQL = '
CREATE VIEW dbo.vw_ToolGroup_Two WITH SCHEMABINDING
AS
SELECT tg.ToolGroupId,
tg.ToolGroupName,
NULL AS ToolId,
NULL AS TGAppId,
NULL AS TGPurposeId,
NULL AS TGRoleId
FROM dbo.toolGroup_tmp tg
INNER JOIN dbo.ToolgroupToeApplication_tmp tgtea
ON tg.ToolGroupId = tgtea.ToolGroupId
'
EXEC SP_EXECUTESQL #SQL
-- Create Indexes
CREATE UNIQUE CLUSTERED INDEX IDX_view_ToolGroup_One
ON vw_ToolGroup_One(ToolGroupId, ToolGroupName, ToolId, TGPurposeId, TGRoleId);
CREATE UNIQUE CLUSTERED INDEX IDX_view_ToolGroup_Two
ON vw_ToolGroup_Two(ToolGroupId, ToolGroupName);
GO
-- Invoke Query
SELECT * FROM vw_ToolGroup_One
UNION ALL
SELECT * FROM vw_ToolGroup_Two tgt
WHERE NOT EXISTS ( SELECT 1
FROM dbo.PurposeToToolGroup_tmp pttg
WHERE pttg.ToolGroupId = tgt.ToolGroupId)