SQL query to get a list of relations between workitems

Question

How can I create a SQL query to get a list of all problems with related changes?  And all problems with related incidents?
I have tried to join the tables RelationshipTypeDim with ProblemDimKey and ChangeRequestDim, but the results are not correct.

Answer 1

The relationships in the data warehouse can be kind of tricky. The relationships are contained in the WorkItemRelatesToWorkItemFactvw table. This table lists the related items by their WorkItemDimKey, so you cannot reference directly from the ChangeRequestDimvw
or ProblemDimvw. You will need to reference the WorkItemDimvw to get the WorkItemDimKey for each entry.
The query below will get all of the related work items from the Change Request class. The way the joins work is ChangeRequestDimvw gets the list of change requests. Then inner joins WorkItemDimvw to get the WorkItemDimKey for each CR. Then inner joins WorkItemRelatesToWorkItemFactvw
to get all of the CRs with related work items. Then inner joins the WorkItemDimvw again to get the ID of the related work item. 
Now the tricky part is it appears that these relationship are set based on which item  that created the relationship. So you need to union a second query that reverse the relationship on the WorkItemRelatesToWorkItemFactvw. 
This query should give you a good start on getting the related work items. You can filter it down from here if you only want to include problems.
SELECT C.ID, WIWI.ID
FROM dbo.ChangeRequestDimvw C
INNER JOIN dbo.WorkItemDimvw WI ON
WI.EntityDimKey = C.EntityDimKey
INNER JOIN dbo.WorkItemRelatesToWorkItemFactvw AS WIRWI ON
WIRWI.WorkItemDimKey = WI.WorkItemDimKey
INNER JOIN dbo.WorkItemDimvw AS WIWI ON
WIWI.WorkItemDimKey = WIRWI.WorkItemRelatesToWorkItem_WorkItemDimKey
union
SELECT C.ID, WIWI.ID
FROM dbo.ChangeRequestDimvw C
INNER JOIN dbo.WorkItemDimvw WI ON
WI.EntityDimKey = C.EntityDimKey
INNER JOIN dbo.WorkItemRelatesToWorkItemFactvw AS WIRWI ON
WIRWI.WorkItemRelatesToWorkItem_WorkItemDimKey = WI.WorkItemDimKey
INNER JOIN dbo.WorkItemDimvw AS WIWI ON
WIWI.WorkItemDimKey = WIRWI.WorkItemDimKey
Order by C.ID
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