equivalent questions... not

Oracle 11.2.0.4

Oracle Linux 5.6

I would have thought that these two queries must return the same result, but NOOOO

This query returns no rows

select username
from dba_users
where username not in (
                       select distinct username
                       from dba_audit_trail
                       where action=100
                       )
order by 1;

This query returns 50 lines

select username
from dba_users
minus 
select distinct username
from dba_audit_trail
where action=100

;

Of course, I forgot something.  For my use, I prefer the first one, I find myself also need to get more out of dba_users columns, so the syntax 'less' doesn't really work.

That's all.

In fact, I had just finished confusing on how I might have an audit record on a connect action, with a user name of NULL values.  finally realized were connections failed .

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