DBA_TRIGGER_COLS

Column usage in all triggers

Columns
   ___________________________
 
   TRIGGER_OWNER
      Owner of the trigger
   TRIGGER_NAME
      Name of the trigger
   TABLE_OWNER
      Owner of the table
   TABLE_NAME
      Name of the table on which the trigger is defined
   COLUMN_NAME
      Name of the column or the attribute of the ADT column used in trigger definition
   COLUMN_LIST
      Is column specified in UPDATE OF clause?
   COLUMN_USAGE
      Usage of column within trigger body

Related:

DBA_TRIGGERS