Oracle UPDATE Joins

MS ACCESS and I think SQL Server makes this very easy for me, but Oracle does not. I'm looking to merge two tables that have identical keys. Essentially, I want to expand column-wise, not row-wise.

This is how it does work in Oracle
UPDATE MAIN m
SET col1 =
(
SELECT s.col1
FROM SIBLING s
WHERE m.key1 = s.key1
AND m.key2 = s.key2
AND m.key3 = s.key3
),
col2 =
(
SELECT s.col2
FROM SIBLING s
WHERE m.key1 = s.key1
AND m.key2 = s.key2
AND m.key3 = s.key3
);

But, I think it's silly that I have to code the query twice to do this. Perhaps processing-wise, Oracle will be efficient about it, and only run it once.

In MSFT, I get to do a join of the two tables, and then an update of one table, all in one shot.

Is there a way to streamline this in Oracle any better than I have?

Thanks

Yes Oracle does not allow FROM clause in an UPDATE statement however it allows to have multiple columns in set clause as

UPDATE MAIN m
SET (col1,col2) =
(
SELECT s.col1,s.col2
FROM SIBLING s
WHERE m.key1 = s.key1
AND m.key2 = s.key2
AND m.key3 = s.key3
);

That's great, just what I was looking for!