PostgreSQL Two-table junction update

PostgreSQL Two-table joint update
Recently use PostgreSQL feel a bit useless, a joint update is not to write this syntax to:
Update D_routetrip
Set Name=b.name,
Description=b.description
From D_scenery as B
where foreignid=b.id and d_routetrip.type= ' scenery '

As mentioned above, and before the D_routetrip table can not alias, set after the application of the table is also directly represented by the field, do not need to refer to the alias or syntax error, and the fields referenced in and after must indicate which table belongs to, otherwise also error. The use of good nerves
The common SQL two-table joint update is much simpler, as follows:
Update Table1
Set TABLE1.CO1=TABLE2.CO1,
Table1.co2=table2.co2
From Table2
where table2.id=table1.id