NTree Example: Show Reporting Structure by Department - Teradata Vantage

Input

The input table, emp_table_by_dept, contains data to build trees of departments, and is partitioned by department. In each partition, each row represents one employee in the department, identifying the employee by identifier and name and his or her manager by identifier. Each employee with no manager becomes the root of the department tree. The other employees in that department become children of their managers.

SQL Call

SELECT * FROM NTree@coprocessor (
  ON emp_table_by_dept PARTITION BY department
  USING
  RootNode (mgr_id = 'none')
  ParentID (mgr_id)
  NodeID (id)
  StartsWith ('ROOT') 
  Direction ('DOWN')
  OutputType ('ALL')
  Results (PATH(name) AS path, PATH(id) AS path2)
) AS dt ORDER BY id;

Output

The output table shows two department trees, whose roots are Dave and Peter.

 id path                       path2          
 -- -------------------------- -------------- 
  1 Dave                       1             
  2 Dave->Kim                  1->2          
  3 Dave->Donna                1->3          
  4 Dave->Rob                  1->4          
  5 Dave->Kim->Fran            1->2->5       
  6 Dave->Kim->Mark            1->2->6       
  7 Dave->Donna->Richard       1->3->7       
  8 Dave->Rob->Pat             1->4->8       
  9 Dave->Rob->Don             1->4->9       
 10 Peter                      10            
 11 Peter->Sarah               10->11        
 12 Peter->Dale                10->12        
 13 Peter->John                10->13        
 14 Peter->Dale->Jessy->Sophia 10->12->15->14
 15 Peter->Dale->Jessy         10->12->15    
 16 Peter->Dale->Gary          10->12->16    
 17 Peter->John->Elizabeth     10->13->17    
 18 Peter->John->Richard       10->13->18

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