Hierarchy based aggregation

Posted by Ganapathy Subramaniam on Stack Overflow See other posts from Stack Overflow or by Ganapathy Subramaniam
Published on 2010-03-12T06:45:51Z Indexed on 2010/03/12 6:47 UTC
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hierarchy

|

aggregation

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SQLServer

I have a hierarchy table in SQL Server 2005 which contains employees -> managers -> department -> location -> state.

Sample table for hierarchy table:

ID  Name        ParentID    Type
1   PA      NULL        0 (group)
2   Pittsburgh  1       1 (subgroup)
3   Accounts    2       1 
4   Alex        3       2 (employee)
5   Robin       3       2
6   HR          2       1
7   Robert      6       2

Second one is fact table which contains employee salary details ID and Salary.

Sample data for fact table:

ID    Salary
4     6000
5     5000
7     4000

Is there any good to way to display the hierarchy from hierarchy table with aggregated sum of salary based on employees. Expected result is like

Name          Salary
PA                15000   (Pittsburgh + others(if any)) 
  Pittusburgh     15000   (Accounts + HR)
    Accounts      11000   (Alex + Robin)
      Alex         6000   (direct values)
      Robin        5000
    HR             4000
      Robert       4000


In my production environment, hierarchy table may contain 23000+ rows and fact table may contain 300,000+ rows. So, I thought of providing any level of groupid to the query to retrieve just its children and its corresponding aggregated value. Any better solution?

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