Re: SQL delete and update at the same time

[Michael Lewis <mlewis@xxxxxxxxxxx>]

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;