Select rows with same id but different values in another column grouped by a third column

Question

I have a table like this:

ID	CODE	VALUE
1	A	123
1	A	456
1	C	123
1	B	789
2	A	344
2	B	344

I would like to see all cases that for the same ID we have different values for different codes.

Result: ID 1, CODE B VALUE 789 NOT FOUND ID 1, CODE A VALUE 456 NOT FOUND

In summary I need to see all diferences the I didn't find on column VALUE based in the ID key BUT NOT FOR THE SAME "CODE" COLUMN.

Anyone know how to achive that?

Thanks a lot!

Answer 1

Provided no duplicate rows exist, ie (ID, CODE, VALUE) is unique you can find VALUEs associated with exactly one CODE each with

select ID, max(CODE) CODE, VALUE
from tbl
group by ID, VALUE
having count(*) = 1