"Markus Bertheau" <mbertheau.pg@googlemail.com> writes:
> I'm kind of stuck as to why postgresql doesn't understand what I mean in the
> following queries:
> UPDATE tag_data td SET td.usage_counter = td.usage_counter + 1 FROM
> tag_list_tag_data ltd WHERE ltd.tag_id = td.id AND ltd.id = 102483;
> ERROR: column "td" of relation "tag_data" does not exist
You aren't supposed to specify a table name (nor alias) for a target
variable in a SET clause. It's useless (since you can't update more
than one table) and it's ambiguous because of the possibility of
composite fields. What you want is something like
UPDATE tag_data td SET usage_counter = td.usage_counter + 1 FROM ...
regards, tom lane
