I have two tables.
Table1 contains companies whose locations are georeferenced with lat/lng coordinates in a column called the_geom
I had a similar problem, but when I tried the solutions mentioned above, I got an error like
Incorrect syntax near 't2'
The code that worked for me is:
UPDATE table2
SET the_geom = t1.the_geom
FROM table1 as t1
WHERE table2.address = t1.address AND table2.the_geom <> t1.the_geom
I know that my answer is 5 years late, but I hope this will help someone like me, who couldn't find this solution.