On Thu, Jun 15, 2000 at 03:58:40PM -0400, Ron Peterson wrote: > PostgreSQL's TODO list (http://www.postgresql.org/docs/todo.html) makes > reference to implementing SQL3 recursive queries. Where does this task > fall in the overall priority of things? I hate to just whine without I want to implement this for some years now. But I haven't found the time to even start yet. > offering to help, but I think this would be a rather big bite to chew. > (Actually, I would be happy to help, if anyone had any suggestions about > what I might be able to do) So at least we are two who are interested in this. > Here's an example from DB2's documentation, cleaned up a bit: Is this SQL3 syntax? > with rpl (part, subpart, quantity) as > ( > select root.part, root.subpart, root.quantity > from partlist root > where root.part = '01' > union all > select child.part, child.subpart, child.quantity > from rpl parent, partlist child > where parent.subpart = child.part > ) Hmm, this doesn't look correct. What if a subpart is used by different parts? I think the second query needs an aggregate. But the above query certainly does solve the ancestor problem. Does anyone have an idea how DB2 executes such a statement? Michael -- Michael Meskes [EMAIL PROTECTED] Go SF 49ers! Go Rhein Fire! Use Debian GNU/Linux! Use PostgreSQL!
