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create table mytable ( ColumnA varchar(20), ColumnB varchar(20) ); insert into mytable values ('ABC', '1'), ('oo', 'bb'), ('oo', NULL), (NULL, 'bb'), (NULL, NULL), ('BCD', '2'), ('bb', 'oo');
7 rows affected
SELECT * FROM mytable WHERE ( columnA <> columnB AND NOT (columnA = 'bb' and columnB = 'oo' or columnA = 'oo' and columnB = 'bb') ) OR columnA IS NULL OR columnB IS NULL
ColumnA
ColumnB
ABC
1
oo
null
null
bb
null
null
BCD
2