How to get the trigger(s) associated with a view or a table in PostgreSQL

I have one requirement that I have to get the list of triggers associated to the given table/view.
Can anyone help me to find the triggers for a table in PostgreSQL?

Solution 1:

This will return all the details you want to know

select * from information_schema.triggers

or if you want to sort the results of a specific table then you can try

SELECT event_object_table
      ,trigger_name
      ,event_manipulation
      ,action_statement
      ,action_timing
FROM  information_schema.triggers
WHERE event_object_table = 'tableName' -- Your table name comes here
ORDER BY event_object_table
     ,event_manipulation

the following will return table name that has trigger

select relname as table_with_trigger
from pg_class
where pg_class.oid in (
        select tgrelid
        from pg_trigger
        )

Solution 2:

The problem with the view information_schema.triggers (besides being slow) is, per documentation:

The view triggers contains all triggers defined in the current database on tables and views that the current user owns or has some privilege other than SELECT on.

Meaning, you only get to see triggers you have appropriate privileges on.

To see all triggers for a table, look in the system catalog pg_trigger

SELECT tgname
FROM   pg_trigger
WHERE  tgrelid = 'myschema.mytbl'::regclass; -- optionally schema-qualified

Works for tables and views.
Or you could use a GUI like pgAdmin that displays the list under the table node in the object browser.

Solution 3:

On psql command-line tool you can also use \dS <table_name> (from https://serverfault.com/questions/331024/how-can-i-show-the-content-of-a-trigger-with-psql)

Solution 4:

select    tgname
    ,relname
    ,tgenabled
    ,nspname    from    pg_trigger 
    join    pg_class    on    (pg_class.oid=pg_trigger.tgrelid) 
    join    pg_namespace    on    (nspowner=relowner);


tgenabled (To check if its disabled)

O = trigger fires in "origin" and "local" modes, 
D = trigger is disabled, 
R = trigger fires in "replica" mode,
A = trigger fires always.