You can certainly store hierarchical data in a database, but it is a bit more complicated.
A simple example is a family tree -- each person entry would have two other people as their parent. These people would all be in the same table, so you'd have to do a join back on the table that you're selecting from.
Alex / talexb / Toronto
Thanks PJ. We owe you so much. Groklaw -- RIP -- 2003 to 2013.
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