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with x as (
select 1 id, 'AA' FIELDA from dual
union select 2, 'BB' from dual
union select 3, '' from dual
union select 4, Null from dual
union select 5, 'CC' from dual
) select * from x where (FIELDA is null or FIELDA != 'CC')
Open in new window
or you can use something like
where ... and (FIELDA is null or FIELDA != 'CC')
where ... and LNNVL(FIELDA = 'CC')
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