"SQL trigger" Code Answer's
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how use trigger in sql
CREATE TRIGGER Product_Details_tr
BEFORE INSERT ON Product_Details
FOR EACH ROW
SET NEW.User_ID = CURRENT_USER();
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);
creation d'un trigger sql
CREATE OR REPLACE TRIGGER trigg_example
BEFORE INSERT OR UPDATE ON table_example
FOR EACH ROW
WHEN (new.no_line > 0)
DECLARE
evol_exemple number;
BEGIN
evol_exemple := :new.exemple - :old.exemple;
DBMS_OUTPUT.PUT_LINE(' evolution : ' || evol_exemple);
END;
Source: sql.sh
what is a trigger in sql
-- SQL Server Syntax
-- Trigger on an INSERT, UPDATE, or DELETE statement to a table or view (DML Trigger)
CREATE [ OR ALTER ] TRIGGER [ schema_name . ]trigger_name
ON { table | view }
[ WITH <dml_trigger_option> [ ,...n ] ]
{ FOR | AFTER | INSTEAD OF }
{ [ INSERT ] [ , ] [ UPDATE ] [ , ] [ DELETE ] }
[ WITH APPEND ]
[ NOT FOR REPLICATION ]
AS { sql_statement [ ; ] [ ,...n ] | EXTERNAL NAME <method specifier [ ; ] > }
<dml_trigger_option> ::=
[ ENCRYPTION ]
[ EXECUTE AS Clause ]
<method_specifier> ::=
assembly_name.class_name.method_name
Source: docs.microsoft.com
mssql trigger examples
CREATE TRIGGER trigger_name
ON { Table name or view name }
[ WITH <Options> ]
{ FOR | AFTER | INSTEAD OF }
{ [INSERT], [UPDATE] , [DELETE] }
Source: www.mssqltips.com
SQL trigger
CREATE TRIGGER [schema_name.]trigger_name
ON table_name
{FOR | AFTER | INSTEAD OF} {[INSERT] [,] [UPDATE] [,] [DELETE]}
AS
{sql_statements}
Source: www.sqlshack.com
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