PostgreSQL How to create AFTER OR BEFORE INSERT in one trigger
1 I know that PostgreSQL can create a trigger that catches more than one event such as UPDATE and INSERT as shown below CREATE TRIGGER my trigger1 AFTER UPDATE OR INSERT ON my table1 FOR EACH ROW EXECUTE FUNCTION my function1 and determine event by TG OP
PostgreSQL Documentation 16 CREATE TRIGGER, The trigger will be associated with the specified table view or foreign table and will execute the specified function function name when certain operations are performed on that table To replace the current definition of an existing trigger use CREATE OR REPLACE TRIGGER specifying the existing trigger s name and parent table
39 4 A Complete Trigger Example PostgreSQL
CREATE FUNCTION trigf RETURNS trigger AS filename LANGUAGE C CREATE TRIGGER tbefore BEFORE INSERT OR UPDATE OR DELETE ON ttest FOR EACH ROW EXECUTE FUNCTION trigf CREATE TRIGGER tafter AFTER INSERT OR UPDATE OR DELETE ON ttest FOR EACH ROW EXECUTE FUNCTION trigf Now you can test the operation of the trigger
PostgreSQL CREATE TRIGGER Statement By Practical Examples, To create a new trigger in PostgreSQL you follow these steps First create a trigger function using CREATE FUNCTION statement Second bind the trigger function to a table by using CREATE TRIGGER statement If you are not familiar with creating a user defined function you can check out the PL pgSQL section Create trigger function syntax
The Ultimate Guide To The PostgreSQL Triggers
The Ultimate Guide To The PostgreSQL Triggers, A PostgreSQL trigger is a function invoked automatically whenever an event such as insert update or delete occurs In this section you will learn about triggers and how to manage them effectively Introduction to PostgreSQL trigger give you a brief overview of PostgreSQL triggers why you should use triggers and when to use them
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Using newly inserted values in trigger function in PostgreSQL
Using newly inserted values in trigger function in PostgreSQL 2 Answers Sorted by 6 Within the trigger function you can use NEW column name to refer to the newly inserted updated value In the reverse OLD column name will refer to the value prior to the update delete More info here https www postgresql docs current static sql createtrigger html Hope that helps Share Improve this answer Follow
SQL Postgres Trigger based Insert Redirection Without Breaking
Just like in most databases in PostgreSQL a trigger is a way to automatically respond to events Maybe you want to run a function if data is inserted into a table Maybe you want to audit the deletion of data or simply respond to some UPDATE statement That is exactly what a trigger is good for How to write a trigger in PostgreSQL Tutorial CYBERTEC. The EDB Docs Webinars A trigger is defined as any event that sets a course of action in a motion In PostgreSQL if you want to take action on specific database events such as INSERT UPDATE DELETE or TRUNCATE then trigger functionality can be useful as it will invoke the required function on defined events Triggers in PostgreSQL are database callback functions that are automatically performed or triggered when certain events occur on a table or view Common use cases for triggers include enforcing business rules auditing and maintaining complex data integrity To create a trigger first you need to define a trigger function using the CREATE
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