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POSQL Identify related rows (Hierarchal)
 

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    <p>I need to identify rows that are related to each other using two fields, to some extent it is a hierarchy, but cant get CTE to work.</p> <p>This is a simplified table:</p> <pre><code>CREATE TABLE [dbo].[LinkedRows]( [ID] [int] NULL, [COL1] [nvarchar](50) NULL, [COL2] [nvarchar](50) NULL, [LINK] [int] NULL ) ON [PRIMARY] </code></pre> <p>Here's some data:</p> <pre><code>INSERT INTO dbo.LinkedRows (ID, COL1, COL2) VALUES (1, 'A','B') INSERT INTO dbo.LinkedRows (ID, COL1, COL2) VALUES (2, 'C','B') INSERT INTO dbo.LinkedRows (ID, COL1, COL2) VALUES (3, 'A','D') INSERT INTO dbo.LinkedRows (ID, COL1, COL2) VALUES (4, 'D','A') INSERT INTO dbo.LinkedRows (ID, COL1, COL2) VALUES (5, 'B','A') INSERT INTO dbo.LinkedRows (ID, COL1, COL2) VALUES (6, 'E','C') INSERT INTO dbo.LinkedRows (ID, COL1, COL2) VALUES (7, 'B','C') INSERT INTO dbo.LinkedRows (ID, COL1, COL2) VALUES (8, 'C','E') INSERT INTO dbo.LinkedRows (ID, COL1, COL2) VALUES (9, 'F','G') INSERT INTO dbo.LinkedRows (ID, COL1, COL2) VALUES (10, 'G','H') </code></pre> <p>This is what I'm trying to determine:</p> <pre><code>ID COL1 COL2 linked 1 A B 1 2 C B 1 3 A D 1 4 D A 1 5 B A 1 6 E C 1 7 B C 1 8 C E 1 9 F G 2 10 G H 2 </code></pre> <p>Rows 1 and 2 both have B in COL2, so A, B and C are all related to each other and have been given the same linked number (ID). In rows 3 and 4 we have A,D and D,A since there is a combination of B,A in row 5, D can be linked to B through A, so now we can link A, B, C, D together. In row 6 and 8 we have E,C and C,E so we can now link A, B, C, D, E together. Row 7 is just the opposite of row 2. In row 9 we have F,G since we cant make a link from either of these to A,B,C,D,E another linked group is created. In row 10 we have G,H which can be linked to linked group 2 through G ie, F,G,H are related.</p> <p>Any help or advice greatly appreciated.</p> <p>Regards CM</p>
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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