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Hierarchical database structures and Firebird PSQL
The idea of storing a hierarchical data in a relational database is very simple, but effective work with such a data requires some knowledge of server-side programming using procedural SQL (PSQL). So the hierarchical data structures are a good chance to get acquainted with PSQL. For demonstration ...http://feeds.feedburner.com/~r/delph...~4/iTPaOFmYJyc
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