Goal Do not cause potentially infinite loops. Recursive trigger fire themselves over and over again. If the system is not able to stop these, then it eventually consumes all the resources of the system. Although the system is able to detect these it is better to avoid creating these altogether.
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. The query does not detect all possible recursions because multiple triggers on different tables can also form a cycle.
Type Problem detection (Each row in the result could represent a flaw in the design)
Reliability High (Few or no false-positive results)
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	
   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 trigger_schema, trigger_table, action_timing, event_manipulation, action_orientation, action_condition, trigger_name, routine_name, regexp_replace(routine_definition,'[\r\n]','
','g') AS routine_definition FROM Tr WHERE ((event_manipulation='INSERT' AND routine_definition~* ('[[:space:]]INSERT[[:space:]]+INTO[[:space:]]+' || trigger_table)) OR (event_manipulation='UPDATE' AND routine_definition~*( '[[:space:]]UPDATE[[:space:]]+' || trigger_table)) OR (event_manipulation='DELETE' AND routine_definition~*( '[[:space:]]DELETE[[:space:]]+FROM[[:space:]]+' || trigger_table))) ORDER BY trigger_schema, trigger_table, routine_name;
Collections

This query belongs to the following collections:

NameDescription
Find problems automaticallyQueries, that results point to problems in the database. Each query in the collection produces an initial assessment. However, a human reviewer has the final say as to whether there is a problem 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.