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create table t (id, created, modified) as select rownum, add_months (date'2020-01-01', rownum-1), cast (null as date) from dual connect by level<=12
12 rows affected
select t.id, coalesce (modified, created) lastchanged from t where months_between (date'2021-12-01', coalesce (modified, created)) < 15
ID
LASTCHANGED
10
01-OCT-20
11
01-NOV-20
12
01-DEC-20