When grilled further on (Sun, 12 Oct 2003 13:06:25 -0400),
Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> confessed:
> 
> The two temp tables share a common parent?
Ops, forgot.  Yes.  "obs_root" (which is what the temp table inherits from), is
a persistent table. The temp table is used to filter data going into other
tables derived from "obs_root".
Cheers,
Rob
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