joining on columns with null value
- From: ryan_gaffuri@xxxxxxxxxxx
- To: oracle-l@xxxxxxxxxxxxx
- Date: Mon, 28 Feb 2005 16:43:41 +0000
I have to join two tables. all of the columns can be null. However, if there
are nulls and the rest of the fields are the same, I want to join to succeed.I
did a test case where i assumed that if i used the following, I would get a
record returned even if there are nulls.
where nvl(tableA.column,0) = nvl(tableB.column,0)
If both of these fields are null and i have the rest of the columns equivalent,
this will not give me a record returned.
However, if i do:
where tableA.column1||tableA.column2||tableA.column3 =
tableB.column1||tableB.column2||tableB.column3
then i get a successful join if one or more of the fields is null but atleast 1
is not.
this is pretty ugly. Any better way to do this?
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