Postgresql trigger to update a column in a table when another table
By default UPDATE table a FROM table b builds CROSS JOIN of all rows from both tables So such UPDATE applies to all rows of table a Solution is simple add to WHERE condition AND a section id NEW section id to limit rows of CROSS JOIN result to only just now updated rows NEW and OLD are a system record which keep values of all columns of row for which trigger function has been called
Insert trigger to Update another table using PostgreSQL, Here we have two tables named table1 and table2 Using a trigger I ll update table2 on insertion into table1 Create the tables CREATE TABLE table1 id integer NOT NULL name character varying CONSTRAINT table1 pkey PRIMARY KEY id CREATE TABLE table2 id integer NOT NULL name character varying
Trigger to update table column when new row is insert in postgresql
I want to write trigger to update table when new row is insert I am using updatea Query like UPDATE table SET geom ST SetSRID ST MakePoint longitude latitude 4326
PostgreSQL Documentation 16 CREATE TRIGGER, Description CREATE TRIGGER creates a new trigger CREATE OR REPLACE TRIGGER will either create a new trigger or replace an existing 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
POSTGRESQL Trigger that updates a column after having altered the table
POSTGRESQL Trigger that updates a column after having altered the table, The process is Add the column with a default value alter table mytable1 add new column int default 0 Initialize the value of the column to the current values update mytable1 t1 set new column select count from mytable2 t2 where t2 field t1 field Add insert update delete triggers on mytable2 The key logic is update mytable1 set
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Update a table column using postgres function Stack Overflow
Update a table column using postgres function Stack Overflow But you can t change the value in an AFTER trigger you need a BEFORE trigger for this CREATE TRIGGER host ip BEFORE INSERT OR UPDATE ON base FOR EACH ROW EXECUTE PROCEDURE host ip Share
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Trigger Functions While many uses of triggers involve user written trigger functions PostgreSQL provides a few built in trigger functions that can be used directly in user defined triggers These are summarized in Table 9 103 Additional built in trigger functions exist which implement foreign key constraints and deferred index constraints PostgreSQL Documentation 16 9 28 Trigger Functions. You don t need to use the parent table in the body of the trigger function because the values from the parent table are available in the function in the special variable OLD and NEW In this case you only need NEW If you need the trigger only on update than define a update only trigger There are multiple things wrong here 1 When you insert a row A the function setAngle is called But in the function you are calling another update within the function which will trigger the function again and again and so on To fix this don t issue a update Just update the NEW records value independently and return it
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