Recognize NULL Values As Being Equal...

Hi,

I'm using SQL SERVER 7.0.


I'm driving myself crazy on this one. I have 2 tables that look like this:


T1T2
C1C2C3C1C2C3
JOE1OTTAWAJOE1TORONTO
MARC1OTTAWAMARC4OTTAWA
GAVINNULLHALIFAXGAVIN3HALIFAX
DARRINNULLHALIFAXDARRIN3HALIFAX
DENISENULLPITTSBURGHDENISENULLPITTSBURGH
LOUISENULLRUSSELLLOUISE2RUSSELL
ANDREA3STITTSVILLEANDREANULLSTITTSVILLE
MARIO66PITTSBURGHGEORGE6KINCARDINE
LARRY6KINCARDINE
MARIO66PITTSBURGH

What I need to do is get all of the records from T2 that don't match EXACTLY to a record in T1. So I figured a LEFT OUTER JOIN should work:

SELECTT2.*
FROMT2 LEFT OUTER JOIN T1
ONT2.C1 = T1.C1
ANDT2.C2 = T1.C2
ANDT2.C3 = T1.C3
WHERET1.C1 IS NULL

But this statement returns the DENISE record when I do this (which has an EXACT match).
So, my thoughts took me to the NULL values in T1.C2 and T2.C2 for this record and I thought that, perhaps, the NULL values aren't being recognized as being equal (as they are UNKNOWN).
So I started digging around and found SET ANSI_NULLS OFF. I tried it but with no luck. Can you offer any insight on this one? What can I do to have NULL values recognized as being equal?

This is the result set that I would like to have returned in this example:

JOE1TORONTO
MARC4OTTAWA
GAVIN3HALIFAX
DARRIN3HALIFAX
LOUISE2RUSSELL
ANDREANULLSTITTSVILLE
GEORGE6KINCARDINE
LARRY6KINCARDINE


I've included a script to build and populate the tables below.

Any help on this will be greatly appreciated.

Thanks in advance,
Darrin

------------------------------------------------
IF EXISTS(
SELECT*
FROMSYSOBJECTS
WHERENAME = 'T1'
)
DROP TABLE T1
GO

IF EXISTS(
SELECT*
FROMSYSOBJECTS
WHERENAME = 'T2'
)
DROP TABLE T2
GO


CREATE TABLE [dbo].[T1] (
[C1] [varchar] (50) NULL ,
[C2] [varchar] (50) NULL ,
[C3] [varchar] (50) NULL
) ON [PRIMARY]
GO

CREATE TABLE [dbo].[T2] (
[C1] [varchar] (50) NULL ,
[C2] [varchar] (50) NULL ,
[C3] [varchar] (50) NULL
) ON [PRIMARY]
GO


INSERT T1 VALUES('JOE', '1', 'OTTAWA')
INSERT T1 VALUES('MARC', '1', 'OTTAWA')
INSERT T1 VALUES('GAVIN', NULL, 'HALIFAX')
INSERT T1 VALUES('DARRIN', NULL, 'HALIFAX')
INSERT T1 VALUES('DENISE', NULL, 'PITTSBURGH')
INSERT T1 VALUES('LOUISE', NULL, 'RUSSELL')
INSERT T1 VALUES('ANDREA', '3', 'STITTSVILLE')
INSERT T1 VALUES('MARIO', '66', 'PITTSBURGH')
GO


INSERT T2 VALUES('JOE', '1', 'TORONTO')
INSERT T2 VALUES('MARC', '4', 'OTTAWA')
INSERT T2 VALUES('GAVIN', '3', 'HALIFAX')
INSERT T2 VALUES('DARRIN', '3', 'HALIFAX')
INSERT T2 VALUES('DENISE', NULL, 'PITTSBURGH')
INSERT T2 VALUES('LOUISE', '2', 'RUSSELL')
INSERT T2 VALUES('ANDREA', NULL, 'STITTSVILLE')
INSERT T2 VALUES('GEORGE', NULL, 'KINCARDINE')
INSERT T2 VALUES('LARRY', NULL, 'KINCARDINE')
INSERT T2 VALUES('MARIO', '66', 'PITTSBURGH')
GO