How to create fast database queries

Archive for March 20th, 2009

Hierarchical queries in MySQL: finding leaves

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In this article, we will find the leaves of the hierarchy tree.

A row is a leaf in a hierarchy tree if it has no children.

In Oracle, there is a speical pseudocolumn that tests if a given row is a leaf in a CONNECT BY query. Surprisingly, it's called CONNECT_BY_ISLEAF.
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Written by Quassnoi

March 20th, 2009 at 11:00 pm

Posted in MySQL