Sorry, I don't know much about postgis at all. I assume you meant to have
THEN 1 in your update statement as well.
I notice b.fid=l.fid and NOT b.fid=l.fid in the two clauses. How about
separate update statements?
UPDATE linesegments l
set edited = 1
WHERE l.gid IN (SELECT li.gid FROM linesegments li, buffered as b WHERE
ST_Contains(b.the_geom, li.the_geom) AND
(l.edited = 0 OR l.edited =
null) AND
NOT b.fid=l.fid);
UPDATE linesegments l
set edited = 2
WHERE l.gid IN (SELECT li.gid FROM linesegments li, buffered as b WHERE
ST_Contains(b.the_geom, li.the_geom) AND
(l.edited = 0 OR l.edited =
null) AND
b.fid=l.fid);
Something like this (and similar for b.fid=l.fid) should be equivalent to
the above as best I can figure. It might be more performant, but I don't
know the internals well enough to say for sure.
UPDATE linesegments l
set edited = 1
FROM buffered as b
WHERE
l.gid = l.gid and ST_Contains(b.the_geom, li.the_geom) AND
(l.edited = 0 OR l.edited =
null) AND
NOT b.fid=l.fid;
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