select A.COLUMN_NAME from all_tab_columns a where a.table_name='TESTA' and a.column_id=(select max(t.column_id) from all_tab_columns t where t.table_name=a.table_name)
select column_name from dba_tab_columns where lower(table_name)='test' and column_id=(select max(column_id) from dba_tab_columns where lower(table_name)='test')
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