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Different tasks of triggers

Query goal: Find different tasks that are solved by using triggers, i.e., different triggers on the same table or different tables that do the same thing are considered to solve one task.
Query type: General (Overview of some aspect of the database.)
Query license: MIT License
Data source: INFORMATION_SCHEMA+system catalog
SQL query: Click on query to copy it

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)),
triggers_columns AS (SELECT Tr.trigger_schema, 
trigger_table, 
action_timing, 
event_manipulation, 
action_orientation, 
action_condition, 
string_agg(coalesce(event_object_column,'')::text, ',<br>' 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]','<br>','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]','<br>','g'))

SELECT routine_definition, 
string_agg(DISTINCT action_timing || ' ' || event_manipulation || ' ' || action_orientation || CASE WHEN action_condition IS NOT NULL THEN ' WHEN(' || action_condition || ') ' ELSE ' ' END || trigger_schema || '.' || trigger_table || CASE WHEN update_columns<>'' THEN '(' || update_columns || ')' ELSE '' END, ',<br>') AS triggers
FROM triggers_columns
GROUP BY routine_definition;

Collections where the query belongs to

Collection nameCollection description
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 where the query belongs to

Category nameCategory description
Triggers and rulesQueries of this category provide information about triggers and rules in a database.

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