Goal Find information about tables that are associated with triggers.
Notes The query does not return information about internally generated triggers, i.e., triggers that enforce, for instance, referential integrity.
Type General (Overview of some aspect of the database.)
License MIT License
Data Source system catalog only
SQL Query
WITH Tr AS (SELECT
    n.nspname AS trigger_schema,
    t.tgname AS trigger_name,
    em.text AS event_manipulation,
    CASE WHEN c.relkind IN ('r','p') THEN 'BASE TABLE'
    WHEN c.relkind='v' THEN 'VIEW'
    WHEN c.relkind='f' THEN 'FOREIGN TABLE' END AS table_type,
    c.relname AS trigger_table    
   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, Tr.trigger_table, Tr.table_type, Count(DISTINCT Tr.trigger_name) AS number_of_triggers,
string_agg(Tr.event_manipulation,',' ORDER BY Tr.event_manipulation) AS events
FROM Tr
GROUP BY  Tr.trigger_schema, Tr.trigger_table, Tr.table_type 
ORDER BY  Tr.trigger_schema, Tr.trigger_table;

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.