Update a table from another table on multiple columns in Oracle 11g - sql

Question

Oracle 11g SQL & both tables have the same column definitions:
VARCHAR2(11)
NUMBER
DATE
DATE
I tried to find a solution to this problem, and this is what I ended up with, which fails:
update jjjTable
set [fourthCol] = B.[fourthOtherCol]
from jjjTable, otherTable B
where jjjTable.[firstCol] = B.[firstOtherCol]
and jjjTable.[secondCol] = B.[secondOtherCol]
and jjjTable.[thirdCol] = B.[thirdOtherCol]
I'm under the impression that I need to have the from in this was based on this article:
SQL update from one Table to another based on a ID match and the edited response from Shivkant
I'm under the impression that I may need to use a join based on this article:
How do I UPDATE from a SELECT in SQL Server? and the response from Robin Day
but as I understand it, joins are only on one column match per row. I'm interested in matching on 3 elements, and I'm not finding a clear path for solution.
Any direction would be well received.

Answer 1

This is what I ended up needing to do as a solution:
DECLARE
CURSOR j_CUR IS
SELECT A.[fourthCol]
FROM JJJtable A, otherTable B
WHERE A.[firstCol] = B.[firstOtherCol]
and A.[secondCol] = B.[secondOtherCol]
and A.[thirdCol] = B.[thirdOtherCol]
FOR UPDATE OF B.[fourthOtherCol];
SOME_DATE DATE;
BEGIN
FOR IDX IN j_CUR LOOP
SOME_DATE :=(IDX.[fourthCol]);
UPDATE otherTable
SET [fourthOtherCol] = SOME_DATE
WHERE CURRENT OF j_CUR;
END LOOP;
END;
Thank you for your efforts and guidance.

Answer 2

This is the close best I was able to get it to work on my similar use case. Try this out.
update jjjTable
SET jjjTable.[fourthCol] = (SELECT distint otherTable.fourthOtherCol from otherTable
WHERE otherTable.firstOtherCol = jjjTable.firstCol and
otherTable.secondOtherCol = jjjTable.secondCol and
otherTable.thirdOtherCol = jjjTable.thirdCol)
WHERE EXISTS (SELECT distint otherTable.fourthOtherCol from otherTable
WHERE otherTable.firstOtherCol = jjjTable.firstCol and
otherTable.secondOtherCol = jjjTable.secondCol and
otherTable.thirdOtherCol = jjjTable.thirdCol);