How to return all rows with duplicate values? Inner join not working!

I have a 3 column table:
location (pk), name, size
I am attempting to select pairs of entries that have the same
name and size but different values for location (it is the
primary key.) My inner join does not seem to return what I need:
select a.location, a.name, a.size, b.location, b.name, b.size
from mytable a, mytable b where a.name = b.name and a.size =
b.size and a.location <> b.location;

One solution is like this:
SELECT dname, loc, deptno
FROM dept
WHERE (dname, loc) IN
(SELECT dname, loc
FROM dept
GROUP BY dname, loc
HAVING COUNT (*) > 1
ORDER BY dname, loc, deptno
Regards
Zlatko Sirotic

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