Question

I’m using SQL Server 2008. Here is what I’m trying to do. I have a table with marketgroupID and parentID. each marketgroup has a name. I’d like to create the hierarchy path of those names.

I tried the CTE solution with a WITH anchor_statement recursive_statement, select. it didn’t work.

I found another solution where you create a new table, and fill in the values iteratively. It’s not the most performant, it duplicates lots of data and columns, but i don’t really care because it’s more or less a one time process on a relatively small database. I’m just looking for a simple solution (like everyone I guess)

Basically, I successfully created the table and copied some values inside of it.

--Create Lineage Table
Create Table Eve.dbo.invLineage(
Node int NOT NULL IDENTITY(100,1),
typeID int,
parentNode int,
marketGroupName nvarchar(100),
marketGroupID int,
Depth tinyint,
Lineage nvarchar(max)
)

and copied values into it.

INSERT INTO EVE.dbo.invLineage ( typeID,marketGroupID)
SELECT [EVE].[dbo].invTypes.typeID,EVE.dbo.invTypes.marketGroupID
FROM EVE.dbo.invTypes
LEFT JOIN eve.dbo.invGroups ON EVE.dbo.invTypes.groupID= eve.dbo.invGroups.groupID
WHERE eve.dbo.invGroups.categoryID=7 AND Eve.dbo.invTypes.published=1

this is an exemple of the result I get at this stage:

 Node   typeID   parentNode marketGroupName marketGroupID Depth Lineage
 100    377      NULL       NULL            605           NULL  NULL
 101    380      NULL       NULL            605           NULL  NULL
 102    393      NULL       NULL            126           NULL  NULL
 103    394      NULL       NULL            126           NULL  NULL
 104    399      NULL       NULL            609           NULL  NULL
 105    400      NULL       NULL            609           NULL  NULL
 106    405      NULL       NULL            604           NULL  NULL
 107    406      NULL       NULL            604           NULL  NULL

So I managed to get a nodeID, a typeID, and a marketGroupID successfully. sorry for the bad display in here, I’m still learning the forums.

Now, I’d like to update the parentNode for each row of the Lineage table.

This information is a column in the marketGroup table.

Here is the request I wrote but that returns 0 rows.

UPDATE T SET T.parentNode=P.Node
FROM Eve.dbo.invLineage as T 
INNER JOIN eve.dbo.invMarketGroups E ON T.marketGroupID=E.marketGroupID
INNER JOIN eve.dbo.invMarketGroups B ON E.parentGroupID=B.marketGroupID
INNER JOIN Eve.dbo.invLineage P ON B.marketGroupID=P.marketGroupID

The first 2 inner joins seems to work fine, but the last one makes it return 0 rows.

Also, I’m following this handy guide : http://www.sqlteam.com/article/more-trees-hierarchies-in-sql

Here are some results i get if i run this select query for debug purpose:

SELECT * --SET T.parentNode=P.Node
FROM Eve.dbo.invLineage as T 
INNER JOIN eve.dbo.invMarketGroups E ON T.marketGroupID=E.marketGroupID
INNER JOIN eve.dbo.invMarketGroups B ON E.parentGroupID=B.marketGroupID
--INNER JOIN eve.dbo.invLineage P ON B.marketGroupID=P.marketGroupID

Node    typeID  parentNode  marketGroupName marketGroupID   Depth   Lineage marketGroupID   parentGroupID   marketGroupName description iconID  hasTypes    marketGroupID   parentGroupID   marketGroupName description iconID  hasTypes
1134    10039   NULL    NULL    760 NULL    NULL    760 9   Civilian Modules    Modules whose specifications are geared toward use on rookie ships. NULL    1   9   NULL    Ship Equipment  Everything the dedicated pilot needs to outfit their ship.  1432    0
2913    21853   NULL    NULL    760 NULL    NULL    760 9   Civilian Modules    Modules whose specifications are geared toward use on rookie ships. NULL    1   9   NULL    Ship Equipment  Everything the dedicated pilot needs to outfit their ship.  1432    0

Answer 1

Both your records have B.marketGroupID = 9.

But your eve.dbo.invLineage table only has marketGroupID IN (605, 126, 209, 604)

So, in short, you get no records because ON B.marketGroupID=P.marketGroupID never finds any matches.