On Tue, May 16, 2006 at 03:18:19PM +0530, Gurjeet Singh wrote: > LEVEL might not be a part of the standard, but it is very handy > when dealing with hierarchical queries. > > The chapter 1 (http://www.oreilly.com/catalog/sqlpr/chapter/ch01.pdf) > of book 'SQL Pocket Guide' elaborates more on it.
Looking at that text, it describes how to generate a LEVEL value using the WITH RECURSIVE method, it seems to me you could apply the same method to what you're doing. Just like how on UPDATE and DELETE queries an invisible "ctid" column is added, LEVEL would be an attribute of the tuple being passed up. I'm assuming that what's actually being implemented is the SQL standard method with the Oracle alternative being another way of specifying the same thing? Have a ncie day, -- Martijn van Oosterhout <kleptog@svana.org> http://svana.org/kleptog/ > From each according to his ability. To each according to his ability to > litigate.
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