Goal Find UPDATE triggers where updated columns are not specified. These triggers could be executed too often because unneeded executions are not prevented.
Notes The query finds UPDATE triggers where the updated columns have not been specified. The query excludes triggers that according to the WHEN clause seem to react to a data change in any column.
Type Problem detection (Each row in the result could represent a flaw in the design)
Reliability Low (Many false-positive results)
License MIT License
Fixing Suggestion Do not let the system to do extra work. Ensure that trigger procedures are executed only if there is a real need of that. Specify a list of columns where updating data will cause execution of the trigger.
Data Source INFORMATION_SCHEMA only
SQL Query
SELECT trigger_schema, trigger_table, trigger_name,  event_manipulation, action_orientation, action_timing, action_condition, columns
FROM
(SELECT 
T. trigger_schema, 
T.event_object_table AS trigger_table,
T.trigger_name,
T.action_condition,
T.event_manipulation,
T.action_orientation,
T.action_timing,
array_agg(event_object_column::text) AS columns
FROM 
  (SELECT * FROM information_schema.triggers WHERE event_manipulation='UPDATE') AS T LEFT JOIN  information_schema.triggered_update_columns AS TUC
ON T.trigger_schema=TUC.trigger_schema AND T.trigger_name=TUC.trigger_name AND
 T.event_object_table=TUC.event_object_table
GROUP BY T. trigger_schema,  T.event_object_table, T.trigger_name, T.event_manipulation,
T.action_orientation,
T.action_timing, T.action_condition) AS f
WHERE columns='{NULL}' 
AND action_condition!~'\*.*(IS[[:space:]]+DISTINCT[[:space:]]+FROM|<>|!=).*\*'
ORDER BY trigger_schema, trigger_table, trigger_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
PerformanceQueries of this category provide information about indexes in a database.
Triggers and rulesQueries of this category provide information about triggers and rules in a database.