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:
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;
But it's a syntax error. I tried a subselect but i'm failing to connect
the subselect's 2nd ID with the update's 2nd ID. Any help ? Thanks,
Jürgen
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TIP 9: the planner will ignore your desire to choose an index scan if your
joining column's datatypes do not match
