PostgreSQL How to create AFTER OR BEFORE INSERT in one trigger
As some have stated in comments answering your ion if you want a trigger to execute BEFORE and AFTER you have to declare two triggers that execute the same function Use of OR The keyword OR is used to specify multiple events as per the docs One of INSERT UPDATE DELETE or TRUNCATE this specifies the event that will fire the trigger
Trigger for checking a given value before INSERT or UPDATE on PostgreSQL, Trigger function You could also use a BEFORE INSERT or BEFORE UPDATE trigger but that s more suitable when the validation rule needs to inspect multiple tables not just the current on that triggered the check Now if you really want to use a trigger function this is how it would look like in your case First you need to create 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
39 4 A Complete Trigger Example PostgreSQL, Next 39 4 A Complete Trigger Example Here is a very simple example of a trigger function written in C Examples of triggers written in procedural languages can be found in the documentation of the procedural languages The function trigf reports the number of rows in the table ttest and skips the actual operation if the command attempts
Postgresql Trigger works for UPDATE but for INSERT Database
Postgresql Trigger works for UPDATE but for INSERT Database , Trigger works for UPDATE but for INSERT In my database schema an organization can have multiple addresses but only one default address I m trying to create a trigger where if the is default column is set to true on an insert or update it sets the rest of the rows to false and the current one to true The update part is working however I m
How To Create Use MySQL Triggers Examples For Before After Triggers
PostgreSQL Documentation 16 43 10 Trigger Functions
PostgreSQL Documentation 16 43 10 Trigger Functions Example 43 4 A PL pgSQL Trigger Function for Auditing This example trigger ensures that any insert update or delete of a row in the emp table is recorded i e audited in the emp audit table The current time and user name are stamped into the row together with the type of operation performed on it
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16 Since you haven t mentioned the RDBMS I assume it is Oracle Below is the trigger If you are using another RDBMS tweak the code to fit the syntax CREATE OR REPLACE TRIGGER TRG CAR AFTER INSERT OR UPDATE ON CAR FOR EACH ROW BEGIN IF new FUEL THEN INSERT INTO FUEL CAR ID VALUES new ID ELSE DELETE FROM FUEL WHERE CAR ID new ID Sql PostgreSQL Trigger on Insert or Update Stack Overflow. The next step is to create a trigger and tell it to call this function CREATE TRIGGER xtrig BEFORE INSERT ON t temperature FOR EACH ROW EXECUTE PROCEDURE f temp Our trigger will only fire on INSERT shortly before it happens What is also noteworthy here In PostgreSQL a trigger on a table can fire for each row or for each statement I created as shown below A table called person A table called log with 1 row inserted in it A view called my v A trigger function called my func whose purpose is to increment num log by 1 A trigger called my t that executes my func before each statement INSERT UPDATE or DELETE on my v CREATE TABLE person name VARCHAR 20 CREATE TABLE log num INTEGER INSERT INTO
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