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;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);T-SQL Create Trigger
CREATE TRIGGER production.trg_product_audit
ON production.products
AFTER INSERT, DELETE
AS
BEGIN
SET NOCOUNT ON;
INSERT INTO production.product_audits(
product_id,
product_name,
brand_id,
category_id,
model_year,
list_price,
updated_at,
operation
)
SELECT
i.product_id,
product_name,
brand_id,
category_id,
model_year,
i.list_price,
GETDATE(),
'INS'
FROM
inserted i
UNION ALL
SELECT
d.product_id,
product_name,
brand_id,
category_id,
model_year,
d.list_price,
GETDATE(),
'DEL'
FROM
deleted d;
END
Code language: SQL (Structured Query Language) (sql)mssql trigger
-- 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_nameSQL trigger
CREATE TRIGGER [schema_name.]trigger_name
ON table_name
{FOR | AFTER | INSTEAD OF} {[INSERT] [,] [UPDATE] [,] [DELETE]}
AS
{sql_statements}Copyright © 2021 Codeinu
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