Jurgen,
> UPDATE a.mytable from b.mytable
> SET a.mycolumn = b.mycolumn
> WHERE a.firstid = some_key
> AND b.firstid = some_other_key
> AND a.secondaryid = b.secondaryid;
Very close, actually; you just need to fix the table alias:
UPDATE mytable
FRO
Hello,
I want to update columns in a table that match a fixed key
from the same column of the same table matching another fixed key.
There can be several tuples per key distinguished by a secondary id.
Tuples are unique with the combined keys. Maybe a query could look
something like this:
