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Fixing the Adjacency List Model

-- cannot be your own boss
CHECK ((boss_id <> emp_id) OR
(boss_id = 0 AND emp_id = 0)),

-- prevent longer cycles
UNIQUE (emp_id, boss_id),

-- connected graph (edges = nodes - 1)
CHECK ((SELECT COUNT(*) FROM orgchart) - 1
= (SELECT COUNT(boss_id) FROM orgchart)),

-- one root only
CHECK ((SELECT COUNT(*) FROM orgchart WHERE
boss_id IS NULL) = 1),


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Published in: Technology, Business
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  • Thank you for this
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  • Hi Lorenzo, could you take a look of this link in which I design some new solutions: https://github.com/drinkjava2/Multiple-Columns-Tree , with 2 fields (sorted) "line" and "level" and a end tag, will easy do query/add/delete operation.
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  • please make this downloadable
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