Check out example codes for "psql lst trigger". It will help you in understanding the concepts better.

Code Example 1

select event_object_schema as table_schema,
       event_object_table as table_name,
       trigger_schema,
       trigger_name,
       string_agg(event_manipulation, ',') as event,
       action_timing as activation,
       action_condition as condition,
       action_statement as definition
from information_schema.triggers
group by 1,2,3,4,6,7,8
order by table_schema,
         table_name;
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