| Re: Tree structure with more than one table [message #7738 is a reply to message #7736] |
Fri, 03 June 2022 04:49  |
AJM
Messages: 2367
Registered: April 2006
Location: Surrey, UK
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Senior Member |
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The tree structure contains only three tables - TREE-TYPE, TREE-LEVEL and TREE-NODE with which you can construct many types of different tree structures. A LEAF is a table in your application database which can contain a foreign key into one of the TREE-NODE entries. When I say "one" I mean one within a particular TREE-TYPE, so it is possible for a LEAF to contain foreign keys into TREE-NODEs with different values for tree_type_id.
If you want you could use your LEAF table as just a stepping stone and have another table acting as a CHILD-LEAF, with multiple rows if necessary, and then in a third application table you could have a foreign key into CHILD-LEAF instead of LEAF.
You still have not provided me with a pictorial example of what structure you are trying to achieve, so I cannot provide a definitive solution.
Tony Marston
http://www.tonymarston.net
http://www.radicore.org
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