Goal Find user-defined triggers that react to data modifications in tables. Triggers should be used only for the tasks that cannot be achieved in a declarative manner, i.e., by declaring a constraint. Triggers of the same table with the same event_manipulation, action_timing, and action_orientation are sorted based on the trigger name. This is the order of execution of triggers.
Notes The Tr subquery has been created based on the subquery of INFORMATION_SCHEMA.triggers view. In the returned body of routine the query replaces each newline character with the line break (br) tag for the better readability in case the query result is displayed in a web browser.
Type General (Overview of some aspect of the database.)
License MIT License
Data Source INFORMATION_SCHEMA+system catalog
SQL Query
WITH Tr AS (SELECT
    n.nspname AS trigger_schema,
    t.tgname AS trigger_name,
    em.text AS event_manipulation,        
    c.relname AS trigger_table, 
    np.nspname AS routine_schema,
    p.proname AS routine_name,
     p.prosrc AS routine_definition,
     (SELECT DISTINCT action_condition FROM INFORMATION_SCHEMA.triggers AS it WHERE it.trigger_schema=n.nspname AND it.event_object_table=c.relname AND it.trigger_name=t.tgname) AS action_condition,    
        CASE t.tgtype::integer & 1
            WHEN 1 THEN 'ROW'
            ELSE 'STATEMENT'
        END AS action_orientation,
        CASE t.tgtype::integer & 66
            WHEN 2 THEN 'BEFORE'
            WHEN 64 THEN 'INSTEAD OF'
            ELSE 'AFTER'
        END AS action_timing,
	EXISTS (SELECT 1 FROM pg_constraint AS c WHERE c.oid=t.tgconstraint AND c.contype='t') AS is_constraint_trigger,
	 t.tginitdeferred AS is_init_deferred
   FROM pg_namespace n,
    pg_class c,
    pg_trigger t,
    pg_proc p,
    pg_namespace np,
    ( VALUES (4,'INSERT'), (8,'DELETE'), (16,'UPDATE'), (32,'TRUNCATE')) em(num, text)
  WHERE n.oid = c.relnamespace 
  AND c.oid = t.tgrelid 
  AND t.tgfoid=p.oid
  AND p.pronamespace=np.oid
  AND (t.tgtype::integer & em.num) <> 0 
  AND NOT t.tgisinternal 
  AND NOT pg_is_other_temp_schema(n.oid))
SELECT Tr.trigger_schema, trigger_table, action_timing, event_manipulation, action_orientation, action_condition, string_agg(event_object_column::text, ',
' ORDER BY event_object_column) AS update_columns, is_constraint_trigger, is_init_deferred, Tr.trigger_name, routine_name, regexp_replace(routine_definition,'[\r\n]','
','g') AS routine_definition FROM Tr LEFT JOIN information_schema.triggered_update_columns AS TUC ON Tr.trigger_schema=TUC.trigger_schema AND Tr.trigger_name=TUC.trigger_name AND Tr.trigger_table=TUC.event_object_table GROUP BY Tr.trigger_schema, Tr.trigger_table, action_timing, event_manipulation, action_orientation, action_condition, is_constraint_trigger, is_init_deferred, Tr.trigger_name, routine_name, regexp_replace(routine_definition,'[\r\n]','
','g') ORDER BY Tr.trigger_schema, Tr.trigger_table, event_manipulation, action_timing, action_orientation, Tr.trigger_name;
Collections

This query belongs to the following collections:

NameDescription
Find problems by overviewQueries that results point to different aspects of database that might have problems. A human reviewer has to decide based on the results as to whether there are problems or not .
Categories

This query is classified under the following categories:

NameDescription
Triggers and rulesQueries of this category provide information about triggers and rules in a database.