Oracle provides three views to view triggers on tables:

1. USER_TRIGGERS describes the triggers owned by the current user. This view does not display the OWNER column.
   
2. ALL_TRIGGERS describes the triggers on tables accessible to the current user.
   
3. DBA_TRIGGERS describes all triggers in the database.
   

These are the columns:

Column Name	Description
OWNER	Owner of the trigger
TRIGGER_NAME	Name of the trigger
TRIGGER_TYPE	When the trigger fires: BEFORE/AFTER and STATEMENT/ROW, INSTEAD OF, COMPOUND
TRIGGERING_EVENT	DML, DDL, or database event that fires the trigger
TABLE_OWNER	Owner of the table on which the trigger is defined
BASE_OBJECT_TYPE	Base object on which the trigger is defined: TABLE, VIEW, SCHEMA, DATABASE
TABLE_NAME	Name of the table that this trigger is associated with, NULL if BASE_OBJECT_TYPE is SCHEMA or DATABASE
COLUMN_NAME	Name of the nested table column (if a nested table trigger), else NULL
REFERENCING_NAMES	Names used for referencing OLD and NEW column values from within the trigger
WHEN_CLAUSE	Must evaluate to TRUE for TRIGGER_BODY to execute
STATUS	ENABLED or DISABLED, trigger will not fire if DISABLED
DESCRIPTION	Trigger description
ACTION_TYPE	Action type of the trigger body: CALL or PL/SQL
TRIGGER_BODY	Statements executed by the trigger when it fires