sql trigger example
-- SQL Server (update my_table after update on my_table)
CREATE TRIGGER trigger_name ON my_table AFTER UPDATE AS
IF UPDATE (col_name) -- Optional, for particular column
BEGIN
UPDATE my_table SET my_col_date = getdate() FROM my_table
END;
-- Oracle (insert into log table after update on my_table)
CREATE OR REPLACE TRIGGER trigger_name AFTER UPDATE ON my_table
FOR EACH ROW
BEGIN
INSERT INTO my_log_table (LOG_DATE, ACTION) VALUES (SYSDATE, 'Changed');
END;CREATE trigger SQL
-- Oracle DB Syntax
CREATE OR REPLACE TRIGGER {trigger_name}
BEFORE | AFTER
INSERT | UPDATE | DELETE
ON {table_name}
(FOR EACH ROW)
{operation to be executed}
-- for example
CREATE TRIGGER log_updates
AFTER INSERT OR UPDATE ON Person
FOR EACH ROW
INSERT INTO LogPerson(ts, IdPerson, surname)
VALUES(CURRENT_TIMESTAMP, NEW.id, NEW.surname);Copyright © 2021 Codeinu
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