Where is the UniqueID value stored in the SharePoint database?

Question

I'm trying to find where the 'UniqueId' field is stored in the SharePoint database for a list item. Not the GUID, but the UniqueID. This value is usually formatted like [ID#;GUID]. The guid here is different than the item guid.
In the documentation the column has a description, 'Lookup to a GUID for an item.' ( http://msdn.microsoft.com/en-us/library/dd961684(v=office.12).aspx )
but I can't find it in the database.
Here is the query I tried.
SELECT UserData.*        
FROM dbo.Lists INNER JOIN dbo.UserData 
ON dbo.Lists.tp_ID = dbo.UserData.tp_ListId
WHERE dbo.UserData.tp_ListId = '[my list]'
This should pull all values from the AllUserData table but it doesn't list 'UniqueID' as a column.

Answer 1

If you have 2 lists, List A contains custom names, List B has a lookup field that points to List A. I go into list B and select a client name ("Contoso"), enter some info, and save it. On the back end, the list item will contain a value of something like:
34#;Contoso
In this scenario the 34 is the SPListItem.ID value of that item in List A. They start at 1 in each list and increment by 1.
Also, running queries against the database directly is not supported and can take your database out of Microsoft's supportability.
Dimitri Ayrapetov (MCSE: SharePoint)