What does "-" mean before a column in where I was seeing an Oracle view sys.dba_audit_trail, and I came across the following where clause:

where   aud.action#     = act.action    (+)
  and - aud.logoff$dead = spm.privilege (+)
  and   aud.logoff$dead = aom.option#   (+)
  and - aud.priv$used   = spx.privilege (+);


I would like to know what - means.

And if possible, know if I can do it with ANSI SQL.
It just negates the value in the column.

For example:

 with data1 as ( select 1 as col1 from dual)
 select -col1, col1
 from data1
 where -col1 = -1;


... returns -1,1.

Fiddle.