SQL Query include nulls in comparison?

Hello, can anyone help me with this query?
select old_num, new_num
from nums
where old_num <> new_num
I would like to select these columns where they don't equal each other. Problem is that some are null, and the query does not return those. I would like for the query to return the columns that are different, including columns that contain nulls. Any ideas?
Thanks in advance.

A null, by definition, is 'any value'. So your where clause
where old_num <> new_num
will exclude that row, because new_num, being null, could conceiveably be considered the same as old_num.
And if you add
and old_num=new_num
the row will be excluded because new_num is conceived as being different.
The solution is to include appropriate IS NULL or IS NOT NULL clasues, which can make the statement messy. For example
where (old_num is not null and new_num is not null and old_num<> new_num)
or (old_num is null and new_num is not null)
or (old_num is not null and new_num is null)although there could be other variants, such as - if both being null is OK and the range of number is always positive, you could say
where NVL(old_num, -1)<>NVL(new_num, -1)

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<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Azman Diron ([email protected]):
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SQL Query include nulls in comparison?

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