Use a right predicate in trigger condition in order to ensure that the trigger executes always when it has to but not more often. IS DISTINCT FROM treats NULL as if it was a known value, rather than unknown. It would be relevant if a column that is referenced in the action condition is optional, i.e., permits NULLs.
Type
Problem detection (Each row in the result could represent a flaw in the design)
Use IS DISTINCT FROM if you compare row variables.
Data Source
INFORMATION_SCHEMA only
SQL Query
SELECT trigger_schema, trigger_name, action_timing, action_orientation, event_manipulation, event_object_schema AS table_schema, event_object_table AS table_name, action_condition
FROM INFORMATION_SCHEMA.triggers
WHERE action_condition ~*'\*.*(<>|!=).*\*'
ORDER BY trigger_schema, trigger_name;
Collections
This query belongs to the following collections:
Name
Description
Find problems automatically
Queries, 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:
Name
Description
Triggers and rules
Queries of this category provide information about triggers and rules in a database.