Update multiple rows in a table from another table when condition exists

Question

I have two tables.

Table1 contains companies whose locations are georeferenced with lat/lng coordinates in a column called the_geom

Answer 1

If you are a mysql user(like me) and if the above script is not working, here is the mysql equivalent.

UPDATE table2 t2, table1 t1
SET    the_geom = t1.the_geom
WHERE  t2.address = t1.address
AND    t2.the_geom <> t1.the_geom; -- avoid empty updates

All credits to the OP.