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*https://www.dlsweb.rmit.edu.au/toolbox/Database/Certificate4_DB_Toolbox/content/models/hierarchical_model.htm | *https://www.dlsweb.rmit.edu.au/toolbox/Database/Certificate4_DB_Toolbox/content/models/hierarchical_model.htm | ||
*http://www.extropia.com/tutorials/sql/hierarchical_databases.html | *http://www.extropia.com/tutorials/sql/hierarchical_databases.html | ||
*http://cept.faprender.org/?p=4 | |||
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