update a table, however I would like to save the old news in an another tabl
Hello all; I have a table called table_one,That contains the following information
carid place
Benz New York
BMW London
This information will usually be updated in the near future, however, I would like a situation where before information is updated, the old information is stored in another table called table_two first. for example, table_one, say that New York is so updated to Toronto, I wantCARiD place
Benz New York
first recorded in table_two before the update is done. How can I do to make it. Thank you
You can use a trigger to insert the old lines to another table.
syntax:
CREATE or REPLACE TRIGGER trigger_name
BEFORE UPDATE
ON table_name
[ FOR EACH ROW ]
DECLARE
-- variable declarations
BEGIN
-- trigger code
EXCEPTION
WHEN ...
-- exception handling
END;
for example
CREATE OR REPLACE TRIGGER emp_before_update
BEFORE UPDATE ON empployee FOR EACH ROW
DECLARE
v_username varchar2(10);
BEGIN
insert into employee_backup
(employee_id,
first_name,
last_name)
values
(:old.employee_id,
:old.first_name,
:old.last_name);
END;
Tags: Database
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