Take a look at contrib/tablefunc there is a function called connectby() that should do what you're looking for.

Otherwise roll your own...

http://archives.postgresql.org/pgsql-sql/2003-10/msg00374.php

John

Thomas Kellerer wrote:
On 08.01.2007 17:24 Scott Marlowe wrote:
On Mon, 2007-01-08 at 07:38, Leandro Repolho wrote:
Hello everybody,
In Oracle i use the command "connect by prior" and i need to use it in
PostgreSQL, what is the sintax?

What does connect by prior do?  Reuse a connection from one db to
another? I don't think there's anything like that in postgresql. You might wanna tell us what an oracle command does next time, since
many folks here aren't that familiar with Oracle.  Heck, I use oracle
everyday and I'm not familiar with connect by prior...

It's used to retrieve hierarchical data e.g. a parent/child relationship. The connect by operator defines the columns which define the hierarchy.

Thomas


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TIP 9: In versions below 8.0, the planner will ignore your desire to
      choose an index scan if your joining column's datatypes do not
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