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Help with complex CTE expression

May 28, 2013, 5:49 am
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Hi all,

I was recently (and very kindly) helped by Jesus under the following thread Common Table Expression Help.

Being a complete newbie to CTE's, I was at a loss on how to achieve my goal and whilst I managed to use Jesus' help to create other needed queries, I have found myself at a loss with this one and am hoping that someone far better at SQL than me can help.

I have the following database:

USE [master]
GO
/****** Object:  Database [TestDatabase]    Script Date: 28/05/2013 13:00:35 ******/
CREATE DATABASE [TestDatabase]
 CONTAINMENT = NONE
 ON  PRIMARY 
( NAME = N'TestDatabase', FILENAME = N'C:\Program Files\Microsoft SQL Server\MSSQL11.ATLASSQL2012\MSSQL\DATA\TestDatabase.mdf' , SIZE = 5120KB , MAXSIZE = UNLIMITED, FILEGROWTH = 1024KB )
 LOG ON 
( NAME = N'TestDatabase_log', FILENAME = N'C:\Program Files\Microsoft SQL Server\MSSQL11.ATLASSQL2012\MSSQL\DATA\TestDatabase_log.ldf' , SIZE = 1024KB , MAXSIZE = 2048GB , FILEGROWTH = 10%)
GO
ALTER DATABASE [TestDatabase] SET COMPATIBILITY_LEVEL = 110
GO
IF (1 = FULLTEXTSERVICEPROPERTY('IsFullTextInstalled'))
begin
EXEC [TestDatabase].[dbo].[sp_fulltext_database] @action = 'enable'
end
GO
ALTER DATABASE [TestDatabase] SET ANSI_NULL_DEFAULT OFF 
GO
ALTER DATABASE [TestDatabase] SET ANSI_NULLS OFF 
GO
ALTER DATABASE [TestDatabase] SET ANSI_PADDING OFF 
GO
ALTER DATABASE [TestDatabase] SET ANSI_WARNINGS OFF 
GO
ALTER DATABASE [TestDatabase] SET ARITHABORT OFF 
GO
ALTER DATABASE [TestDatabase] SET AUTO_CLOSE OFF 
GO
ALTER DATABASE [TestDatabase] SET AUTO_CREATE_STATISTICS ON 
GO
ALTER DATABASE [TestDatabase] SET AUTO_SHRINK OFF 
GO
ALTER DATABASE [TestDatabase] SET AUTO_UPDATE_STATISTICS ON 
GO
ALTER DATABASE [TestDatabase] SET CURSOR_CLOSE_ON_COMMIT OFF 
GO
ALTER DATABASE [TestDatabase] SET CURSOR_DEFAULT  GLOBAL 
GO
ALTER DATABASE [TestDatabase] SET CONCAT_NULL_YIELDS_NULL OFF 
GO
ALTER DATABASE [TestDatabase] SET NUMERIC_ROUNDABORT OFF 
GO
ALTER DATABASE [TestDatabase] SET QUOTED_IDENTIFIER OFF 
GO
ALTER DATABASE [TestDatabase] SET RECURSIVE_TRIGGERS OFF 
GO
ALTER DATABASE [TestDatabase] SET  DISABLE_BROKER 
GO
ALTER DATABASE [TestDatabase] SET AUTO_UPDATE_STATISTICS_ASYNC OFF 
GO
ALTER DATABASE [TestDatabase] SET DATE_CORRELATION_OPTIMIZATION OFF 
GO
ALTER DATABASE [TestDatabase] SET TRUSTWORTHY OFF 
GO
ALTER DATABASE [TestDatabase] SET ALLOW_SNAPSHOT_ISOLATION OFF 
GO
ALTER DATABASE [TestDatabase] SET PARAMETERIZATION SIMPLE 
GO
ALTER DATABASE [TestDatabase] SET READ_COMMITTED_SNAPSHOT OFF 
GO
ALTER DATABASE [TestDatabase] SET HONOR_BROKER_PRIORITY OFF 
GO
ALTER DATABASE [TestDatabase] SET RECOVERY FULL 
GO
ALTER DATABASE [TestDatabase] SET  MULTI_USER 
GO
ALTER DATABASE [TestDatabase] SET PAGE_VERIFY CHECKSUM  
GO
ALTER DATABASE [TestDatabase] SET DB_CHAINING OFF 
GO
ALTER DATABASE [TestDatabase] SET FILESTREAM( NON_TRANSACTED_ACCESS = OFF ) 
GO
ALTER DATABASE [TestDatabase] SET TARGET_RECOVERY_TIME = 0 SECONDS 
GO
EXEC sys.sp_db_vardecimal_storage_format N'TestDatabase', N'ON'
GO
USE [TestDatabase]
GO
/****** Object:  Table [dbo].[AttributeGroups]    Script Date: 28/05/2013 13:00:35 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[AttributeGroups](
	[AttributeGroupId] [int] IDENTITY(1,1) NOT NULL,
	[Name] [nvarchar](50) NOT NULL,
 CONSTRAINT [PK_AttributeGroups] PRIMARY KEY CLUSTERED 
(
	[AttributeGroupId] 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].[Attributes]    Script Date: 28/05/2013 13:00:35 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Attributes](
	[AttributeId] [int] IDENTITY(1,1) NOT NULL,
	[AttributeGroupId] [int] NOT NULL,
	[AttributeValue] [decimal](22, 6) NOT NULL,
 CONSTRAINT [PK_Attributes] PRIMARY KEY CLUSTERED 
(
	[AttributeId] 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].[AttributesToItems]    Script Date: 28/05/2013 13:00:35 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[AttributesToItems](
	[AttributeId] [int] NOT NULL,
	[ItemId] [int] NOT NULL,
 CONSTRAINT [PK_AttributesToItems] PRIMARY KEY CLUSTERED 
(
	[AttributeId] ASC,
	[ItemId] 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].[Containers]    Script Date: 28/05/2013 13:00:35 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Containers](
	[ContainerId] [int] IDENTITY(1,1) NOT NULL,
	[BaseContainerId] [int] NULL,
	[Name] [nvarchar](50) NOT NULL,
 CONSTRAINT [PK_Containers] PRIMARY KEY CLUSTERED 
(
	[ContainerId] 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].[ItemRelationships]    Script Date: 28/05/2013 13:00:35 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[ItemRelationships](
	[ChildItemId] [int] NOT NULL,
	[ParentItemId] [int] NOT NULL,
 CONSTRAINT [PK_ItemRelationships] PRIMARY KEY CLUSTERED 
(
	[ChildItemId] ASC,
	[ParentItemId] 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].[Items]    Script Date: 28/05/2013 13:00:35 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Items](
	[ItemId] [int] IDENTITY(1,1) NOT NULL,
	[ContainerId] [int] NOT NULL,
	[Name] [nvarchar](50) NOT NULL,
 CONSTRAINT [PK_Items] PRIMARY KEY CLUSTERED 
(
	[ItemId] 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].[AttributeGroups] ON 

GO
INSERT [dbo].[AttributeGroups] ([AttributeGroupId], [Name]) VALUES (1, N'Group 1')
GO
SET IDENTITY_INSERT [dbo].[AttributeGroups] OFF
GO
SET IDENTITY_INSERT [dbo].[Attributes] ON 

GO
INSERT [dbo].[Attributes] ([AttributeId], [AttributeGroupId], [AttributeValue]) VALUES (1, 1, CAST(10.000000 AS Decimal(22, 6)))
GO
INSERT [dbo].[Attributes] ([AttributeId], [AttributeGroupId], [AttributeValue]) VALUES (3, 1, CAST(20.000000 AS Decimal(22, 6)))
GO
INSERT [dbo].[Attributes] ([AttributeId], [AttributeGroupId], [AttributeValue]) VALUES (4, 1, CAST(30.000000 AS Decimal(22, 6)))
GO
INSERT [dbo].[Attributes] ([AttributeId], [AttributeGroupId], [AttributeValue]) VALUES (5, 1, CAST(40.000000 AS Decimal(22, 6)))
GO
INSERT [dbo].[Attributes] ([AttributeId], [AttributeGroupId], [AttributeValue]) VALUES (6, 1, CAST(50.000000 AS Decimal(22, 6)))
GO
INSERT [dbo].[Attributes] ([AttributeId], [AttributeGroupId], [AttributeValue]) VALUES (7, 1, CAST(60.000000 AS Decimal(22, 6)))
GO
INSERT [dbo].[Attributes] ([AttributeId], [AttributeGroupId], [AttributeValue]) VALUES (8, 1, CAST(70.000000 AS Decimal(22, 6)))
GO
INSERT [dbo].[Attributes] ([AttributeId], [AttributeGroupId], [AttributeValue]) VALUES (9, 1, CAST(80.000000 AS Decimal(22, 6)))
GO
INSERT [dbo].[Attributes] ([AttributeId], [AttributeGroupId], [AttributeValue]) VALUES (10, 1, CAST(90.000000 AS Decimal(22, 6)))
GO
INSERT [dbo].[Attributes] ([AttributeId], [AttributeGroupId], [AttributeValue]) VALUES (11, 1, CAST(100.000000 AS Decimal(22, 6)))
GO
INSERT [dbo].[Attributes] ([AttributeId], [AttributeGroupId], [AttributeValue]) VALUES (12, 1, CAST(110.000000 AS Decimal(22, 6)))
GO
INSERT [dbo].[Attributes] ([AttributeId], [AttributeGroupId], [AttributeValue]) VALUES (13, 1, CAST(120.000000 AS Decimal(22, 6)))
GO
SET IDENTITY_INSERT [dbo].[Attributes] OFF
GO
INSERT [dbo].[AttributesToItems] ([AttributeId], [ItemId]) VALUES (1, 1)
GO
INSERT [dbo].[AttributesToItems] ([AttributeId], [ItemId]) VALUES (3, 2)
GO
INSERT [dbo].[AttributesToItems] ([AttributeId], [ItemId]) VALUES (4, 3)
GO
INSERT [dbo].[AttributesToItems] ([AttributeId], [ItemId]) VALUES (5, 4)
GO
INSERT [dbo].[AttributesToItems] ([AttributeId], [ItemId]) VALUES (6, 5)
GO
INSERT [dbo].[AttributesToItems] ([AttributeId], [ItemId]) VALUES (7, 6)
GO
INSERT [dbo].[AttributesToItems] ([AttributeId], [ItemId]) VALUES (8, 7)
GO
INSERT [dbo].[AttributesToItems] ([AttributeId], [ItemId]) VALUES (9, 8)
GO
INSERT [dbo].[AttributesToItems] ([AttributeId], [ItemId]) VALUES (10, 9)
GO
INSERT [dbo].[AttributesToItems] ([AttributeId], [ItemId]) VALUES (11, 10)
GO
INSERT [dbo].[AttributesToItems] ([AttributeId], [ItemId]) VALUES (12, 11)
GO
INSERT [dbo].[AttributesToItems] ([AttributeId], [ItemId]) VALUES (13, 12)
GO
SET IDENTITY_INSERT [dbo].[Containers] ON 

GO
INSERT [dbo].[Containers] ([ContainerId], [BaseContainerId], [Name]) VALUES (1, NULL, N'Level 1')
GO
INSERT [dbo].[Containers] ([ContainerId], [BaseContainerId], [Name]) VALUES (2, 1, N'Level 2')
GO
INSERT [dbo].[Containers] ([ContainerId], [BaseContainerId], [Name]) VALUES (3, 1, N'Level 2b')
GO
INSERT [dbo].[Containers] ([ContainerId], [BaseContainerId], [Name]) VALUES (4, 2, N'Level 3')
GO
INSERT [dbo].[Containers] ([ContainerId], [BaseContainerId], [Name]) VALUES (5, NULL, N'TypeB')
GO
SET IDENTITY_INSERT [dbo].[Containers] OFF
GO
INSERT [dbo].[ItemRelationships] ([ChildItemId], [ParentItemId]) VALUES (1, 13)
GO
INSERT [dbo].[ItemRelationships] ([ChildItemId], [ParentItemId]) VALUES (2, 13)
GO
INSERT [dbo].[ItemRelationships] ([ChildItemId], [ParentItemId]) VALUES (3, 13)
GO
INSERT [dbo].[ItemRelationships] ([ChildItemId], [ParentItemId]) VALUES (4, 14)
GO
INSERT [dbo].[ItemRelationships] ([ChildItemId], [ParentItemId]) VALUES (5, 14)
GO
INSERT [dbo].[ItemRelationships] ([ChildItemId], [ParentItemId]) VALUES (6, 14)
GO
INSERT [dbo].[ItemRelationships] ([ChildItemId], [ParentItemId]) VALUES (7, 15)
GO
INSERT [dbo].[ItemRelationships] ([ChildItemId], [ParentItemId]) VALUES (8, 15)
GO
INSERT [dbo].[ItemRelationships] ([ChildItemId], [ParentItemId]) VALUES (9, 15)
GO
INSERT [dbo].[ItemRelationships] ([ChildItemId], [ParentItemId]) VALUES (10, 16)
GO
INSERT [dbo].[ItemRelationships] ([ChildItemId], [ParentItemId]) VALUES (11, 16)
GO
INSERT [dbo].[ItemRelationships] ([ChildItemId], [ParentItemId]) VALUES (12, 16)
GO
INSERT [dbo].[ItemRelationships] ([ChildItemId], [ParentItemId]) VALUES (13, 17)
GO
INSERT [dbo].[ItemRelationships] ([ChildItemId], [ParentItemId]) VALUES (14, 17)
GO
INSERT [dbo].[ItemRelationships] ([ChildItemId], [ParentItemId]) VALUES (15, 17)
GO
INSERT [dbo].[ItemRelationships] ([ChildItemId], [ParentItemId]) VALUES (1007, 13)
GO
INSERT [dbo].[ItemRelationships] ([ChildItemId], [ParentItemId]) VALUES (1008, 17)
GO
SET IDENTITY_INSERT [dbo].[Items] ON 

GO
INSERT [dbo].[Items] ([ItemId], [ContainerId], [Name]) VALUES (1, 1, N'A')
GO
INSERT [dbo].[Items] ([ItemId], [ContainerId], [Name]) VALUES (2, 1, N'B')
GO
INSERT [dbo].[Items] ([ItemId], [ContainerId], [Name]) VALUES (3, 1, N'C')
GO
INSERT [dbo].[Items] ([ItemId], [ContainerId], [Name]) VALUES (4, 1, N'D')
GO
INSERT [dbo].[Items] ([ItemId], [ContainerId], [Name]) VALUES (5, 1, N'E')
GO
INSERT [dbo].[Items] ([ItemId], [ContainerId], [Name]) VALUES (6, 1, N'F')
GO
INSERT [dbo].[Items] ([ItemId], [ContainerId], [Name]) VALUES (7, 1, N'G')
GO
INSERT [dbo].[Items] ([ItemId], [ContainerId], [Name]) VALUES (8, 1, N'H')
GO
INSERT [dbo].[Items] ([ItemId], [ContainerId], [Name]) VALUES (9, 1, N'I')
GO
INSERT [dbo].[Items] ([ItemId], [ContainerId], [Name]) VALUES (10, 1, N'J')
GO
INSERT [dbo].[Items] ([ItemId], [ContainerId], [Name]) VALUES (11, 1, N'K')
GO
INSERT [dbo].[Items] ([ItemId], [ContainerId], [Name]) VALUES (12, 1, N'L')
GO
INSERT [dbo].[Items] ([ItemId], [ContainerId], [Name]) VALUES (13, 2, N'A2')
GO
INSERT [dbo].[Items] ([ItemId], [ContainerId], [Name]) VALUES (14, 2, N'A2')
GO
INSERT [dbo].[Items] ([ItemId], [ContainerId], [Name]) VALUES (15, 2, N'C2')
GO
INSERT [dbo].[Items] ([ItemId], [ContainerId], [Name]) VALUES (16, 3, N'D2B')
GO
INSERT [dbo].[Items] ([ItemId], [ContainerId], [Name]) VALUES (17, 4, N'A3')
GO
INSERT [dbo].[Items] ([ItemId], [ContainerId], [Name]) VALUES (1007, 5, N'TypeB1')
GO
INSERT [dbo].[Items] ([ItemId], [ContainerId], [Name]) VALUES (1008, 5, N'TypeB2')
GO
SET IDENTITY_INSERT [dbo].[Items] OFF
GO
ALTER TABLE [dbo].[Attributes]  WITH CHECK ADD  CONSTRAINT [FK_Attributes_AttributeGroups] FOREIGN KEY([AttributeGroupId])
REFERENCES [dbo].[AttributeGroups] ([AttributeGroupId])
ON UPDATE CASCADE
ON DELETE CASCADE
GO
ALTER TABLE [dbo].[Attributes] CHECK CONSTRAINT [FK_Attributes_AttributeGroups]
GO
ALTER TABLE [dbo].[AttributesToItems]  WITH CHECK ADD  CONSTRAINT [FK_AttributesToItems_Attributes] FOREIGN KEY([AttributeId])
REFERENCES [dbo].[Attributes] ([AttributeId])
ON UPDATE CASCADE
ON DELETE CASCADE
GO
ALTER TABLE [dbo].[AttributesToItems] CHECK CONSTRAINT [FK_AttributesToItems_Attributes]
GO
ALTER TABLE [dbo].[AttributesToItems]  WITH CHECK ADD  CONSTRAINT [FK_AttributesToItems_Items] FOREIGN KEY([ItemId])
REFERENCES [dbo].[Items] ([ItemId])
ON UPDATE CASCADE
ON DELETE CASCADE
GO
ALTER TABLE [dbo].[AttributesToItems] CHECK CONSTRAINT [FK_AttributesToItems_Items]
GO
ALTER TABLE [dbo].[Containers]  WITH CHECK ADD  CONSTRAINT [FK_Containers_Containers] FOREIGN KEY([BaseContainerId])
REFERENCES [dbo].[Containers] ([ContainerId])
GO
ALTER TABLE [dbo].[Containers] CHECK CONSTRAINT [FK_Containers_Containers]
GO
ALTER TABLE [dbo].[ItemRelationships]  WITH CHECK ADD  CONSTRAINT [FK_ItemRelationships_ChildItems] FOREIGN KEY([ParentItemId])
REFERENCES [dbo].[Items] ([ItemId])
GO
ALTER TABLE [dbo].[ItemRelationships] CHECK CONSTRAINT [FK_ItemRelationships_ChildItems]
GO
ALTER TABLE [dbo].[ItemRelationships]  WITH CHECK ADD  CONSTRAINT [FK_ItemRelationships_ParentItems] FOREIGN KEY([ChildItemId])
REFERENCES [dbo].[Items] ([ItemId])
GO
ALTER TABLE [dbo].[ItemRelationships] CHECK CONSTRAINT [FK_ItemRelationships_ParentItems]
GO
ALTER TABLE [dbo].[Items]  WITH CHECK ADD  CONSTRAINT [FK_Items_Containers] FOREIGN KEY([ContainerId])
REFERENCES [dbo].[Containers] ([ContainerId])
ON UPDATE CASCADE
ON DELETE CASCADE
GO
ALTER TABLE [dbo].[Items] CHECK CONSTRAINT [FK_Items_Containers]
GO
USE [master]
GO
ALTER DATABASE [TestDatabase] SET  READ_WRITE 
GO

Logically, what I need to do is:

  1. Provide a ContainerId as a parameter AND a AttributeGroupId as a parameter
  2. Select all Items within the Container
  3. Move down the Container hierarchy to the absolute base Container of that provided in step 1, selecting all of the Child Items of those selected in Step 2 at each step (limited to those within the Child-to-Parent ItemRelationships).  Note - it is important that only child objects within the immediate Container's base Container are selected.  It is also important to note that the absolute base container could be the next level down, or even the ninth, or... etc.
  4. Using the selected absolute "base" items, obtain the linked Attributes (where they fall within the specified AttributeGroupId)
  5. Sum the attributes back up the hierarchy to the items within the specified Container.

Success so far:

I've successfully achieved items 1 to 4 (with partial 5) using the following:

DECLARE @containerId INT = 4;
DECLARE @attributeGroupId INT = 1;

    -- Insert statements for procedure here
	WITH H
	AS
	(
		SELECT
			I.*,
			CAST(NULL AS INT) AS ParentItemId
		FROM
			dbo.Items I
		WHERE
			I.ContainerId = @containerId
	
		UNION ALL
	
		SELECT
			I.*,
			R.ParentItemId
		FROM 
			dbo.ItemRelationships R
			INNER JOIN H ON H.ItemId = R.ParentItemId
			INNER JOIN dbo.Items I ON R.ChildItemId = I.ItemId

	), BC -- recursive base container
	AS
	(
		SELECT
			C.ContainerId,
			C.BaseContainerId
		FROM 
			dbo.Items I
			INNER JOIN dbo.Containers C
				ON I.ContainerId = C.ContainerId
		WHERE
			I.ContainerId = @containerId
			
		UNION ALL
	
		SELECT
			C.ContainerId,
			C.BaseContainerId
		FROM
			dbo.Containers C
			INNER JOIN BC ON BC.BaseContainerId = C.ContainerId
			
	)
	, C -- Containers
	AS
	(
		-- The anchor is the root container
		SELECT DISTINCT -- use of DISTINCT massively improves performance
			BC.ContainerId
		FROM 
			BC
		WHERE
			BC.BaseContainerId IS NULL -- 
		
		UNION ALL
	
		-- Child containers
		SELECT
			CNT.ContainerId
		FROM
			dbo.Containers CNT
			INNER JOIN C ON C.ContainerId = CNT.BaseContainerId

	)
	SELECT
		--H.ItemId,
		H.ParentItemId,
		--H.ContainerId,
		--H.Name,
		--CAST(NULL AS DECIMAL) AS AttributeValue
		SUM(A.AttributeValue) as AttributeValue
	FROM
		H
		INNER JOIN
		dbo.AttributesToItems ATI ON H.ItemId = ATI.ItemId
		INNER JOIN
		dbo.Attributes A on ATI.AttributeId = A.AttributeId
	WHERE
		H.ContainerId IN (
			SELECT C.ContainerId
			FROM C
		)
		AND
		A.AttributeGroupId = @attributeGroupId
	GROUP BY
		H.ParentItemId

If I enter a ContainerId of 1, I get "NULL", "780" as the results.  Not really an issue as other logic will prevent this from being called on a base Container level.  For a ContainerId of 2 I get the following:

Which is correct.  However, if I enter a ContainerId of 4 I still get the above, but what I actually want it to do is return Item with ID of 17 (which has child items of 13,14,15 in ContainerId 2 - the base of ContainerId 4 in which lies Item ID 17) and a AttributeValue of "450.000000".  What is not happening is the automatic "recursion" back up the hierarchy.  I understand why this is from the query supplied above, but I don't know how to do what is intended.

Please can someone help?

Final notes:

  • This is a simplified version of the actual scenario which contains many, many containers with thousands of Items.  I hope however I have supplied enough to obtain your kind help.
  • There are also many AttributeGroups so it is key to select only those Attributes within the specified group.

Thank you in advance.

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