I'm trying to create after insert trigger to delete a row from table whenever I insert the same row in the opposite table using the ID
But it doesn't work
Create Trigger [dbo].[MeritedDeceased] On [dbo].[Deceased]
After Insert
As
Begin
Delete From dbo.Merited Where dbo.Deceased.ID = dbo.Merited.ID
End
I think you mean to do something like this (maybe)...
CREATE TRIGGER [dbo].[MeritedDeceased] ON [dbo].[Deceased]
AFTER INSERT
AS
BEGIN
DELETE M
FROM [dbo].[MeritedDeceased] M
INNER JOIN Inserted I
ON I.ID = M.ID
;
END
;
Translation: Every time a row is inserted into dbo.Deceased, delete any rows with the same (inserted) ID from dbo.MeritedDeceased.
FYI, this TRIGGER won't just delete one row, but also a batch of rows that were inserted together. If that's what you want, then this should help.
Related
I'm not sure how to create this trigger,.I need to add a row in pub_info table when a row is inserted in publishers table. The exact same row. SQL server
CREATE TRIGGER checkCity
ON pub_info
AFTER INSERT
AS
IF -- a row is inserted into publishers table,
-- how do I add the same row into pub_info table?
INSERT VALUES(#pub_id, NULL, 'new publishers')
BEGIN
END;
You have to create a trigger on publishers table and not on pub_info .
The inserted data is available in the INSERTED table in the trigger
CREATE TRIGGER checkCity
ON publishers
AFTER INSERT
AS
BEGIN
INSERT INTO pub_info(pubid, pubname, pub_description)
SELECT pubid, pubname, pub_description
FROM INSERTED;
END;
There are 2 tables orders and pizza. I have to create trigger update_order_pizza which will insert row in table order_pizza after new row is inserted in table order ( or when row is updated).
Code under trigger work when I launch in SQL, but I don't see what changes in table order_pizza after I inserted row in order.
CREATE DEFINER=`root`#`localhost` TRIGGER `update_order_pizza` AFTER INSERT ON `orders` FOR EACH ROW BEGIN
set #orderid = (select max(order_id) from orders);
set #pizzaid = (select max(pizza_id) from pizza);
insert into order_pizza(order_id,pizza_id)
values(#orderid,#pizzaid);
END
I expect to see next
If I insert new order , let;s say order id=36 in table order_pizza should be inserted new record (36,64)
Your code should be using the new variable to reference rows. In addition, your tables should be defining the ids as auto-increment.
So, the code should look more like this:
create trigger `update_order_pizza` after update on `orders`
for each row
begin
insert into order_pizza (order_id)
values (new.order_id);
end;
Alternatively, the pizza_id might be in the orders table, and you may intend:
insert into order_pizza (order_id, pizza_id)
values (new.order_id, new.pizza_id);
I Have Table Name Called Widgets And There is Delete Trigger On it. When i Delete one specific Row I want Delete Also Other Rows Which Has Relotionship
Trigger Like
ALTER TRIGGER [dbo].[Trigger_sys_widgets_Delete]
ON [dbo].[sys_widgets]
AFTER DELETE
AS
BEGIN
Delete From sys_Widgets Where parent in (Select id From deleted);
END
But This doesn't delete other Rows Just First Row Deleted !
Can i make This Trigger Works on Depete loop till Nothing Left in relative Childs
Also Try To Cascade Delete Like
Alter Table sys_widgets Add Constraint FK_sys_widgets foreign Key (parent) References sys_widgets(id) On Delete Cascade;
Is This Possible To Do That For Same Table
You may use recursive CTE to delete all children by one trigger run.
ALTER TRIGGER [dbo].[Trigger_sys_widgets_Delete]
ON [dbo].[sys_widgets]
AFTER DELETE
AS
BEGIN
WITH ForDelete AS
(
SELECT widgets.id
FROM [dbo].[sys_widgets] AS widgets
INNER JOIN deleted ON widgets.parent = deleted.id
UNION ALL
SELECT widgets.id
FROM [dbo].[sys_widgets] AS widgets
INNER JOIN ForDelete ON widgets.parent = ForDelete.id
)
DELETE FROM [dbo].[sys_widgets]
WHERE id in (SELECT id FROM ForDelete);
END
I want a trigger that updates the value of a column, but I just want to update a small set of rows that depends of the values of the inserted row.
My trigger is:
CREATE OR REPLACE TRIGGER example
AFTER INSERT ON table1
FOR EACH ROW
BEGIN
UPDATE table1 t
SET column2 = 3
WHERE t.column1 = :new.column1;
END;
/
But as I using FOR EACH ROW I have a problem when I try it, I get the mutating table runtime error.
Other option is not to set the FOR EACH ROW, but if I do this, I dont know the inserted "column1" for comparing (or I dont know how to known it).
What can I do for UPDATING a set of rows that depends of the last inserted row?
I am using Oracle 9.
You should avoid the DML statements on the same table as defined in a trigger. Use before DML to change values of the current table.
create or replace trigger example
before insert on table1
for each row
begin
:new.column2 := 3;
end;
/
You can modify the same table with pragma autonomous_transaction:
create or replace trigger example
after insert on table1 for each row
declare
procedure setValues(key number) is
pragma autonomous_transaction;
begin
update table1 t
set column2 = 3
where t.column1 = key
;
end setValues;
begin
setValues(:new.column1);
end;
/
But I suggest you follow #GordonLinoff answere to your question - it's a bad idea to modify the same table in the trigger body.
See also here
If you need to update multiple rows in table1 when you are updating one row, then you would seem to have a problem with the data model.
This need suggests that you need a separate table with one row per column1. You can then fetch the value in that table using join. The trigger will then be updating another table, so there will be no mutation problem.
`create table A
(
a INTEGER,
b CHAR(10)
);
create table B
(
b CHAR (10),
d INTEGER
);
create trigger trig1
AFTER INSERT ON A
REFERENCING NEW AS newROW
FOR EACH ROW
when(newROW.a<=10)
BEGIN
INSERT into B values(:newROW.b,:newROW.a);
END trig1;
insert into A values(11,'Gananjay');
insert into A values(5,'Hritik');
select * from A;
select * from B;`
I've created a trigger as follows:
create or replace trigger "PASSENGERS_BACKUP_T1"
after
insert or update or delete on "PASSENGERS"
for each row
begin
if :NEW."P_ID" is NOT null then
INSERT INTO PASSENGERS_BACKUP(
PB_ID,
PB_FIRST_NAME,
PB_LAST_NAME,
PB_STREET_ADDRESS1,
PB_STREET_ADDRESS2,
PB_CITY,
PB_STATE,
PB_POSTAL_CODE,
PB_EMAIL,
PB_PHONE_NUMBER1,
PB_PHONE_NUMBER2,
PB_URL,
PB_CREDIT_LIMIT,
PB_TAGS)
VALUES (
:new.P_ID,
:new.P_FIRST_NAME,
:new.P_LAST_NAME,
:new.P_STREET_ADDRESS1,
:new.P_STREET_ADDRESS2,
:new.P_CITY,
:new.P_STATE,
:new.P_POSTAL_CODE,
:new.P_EMAIL,
:new.PHONE_NUMBER1,
:new.PHONE_NUMBER1,
:new.URL,
:new.CREDIT_LIMIT,
:new.TAGS);
end if;
end;
now, when I update​ an existing row in "passengers" table as per the above trigger another new row is getting added in "passengers_backup" table instead I would like to update the existing row whenever an update is done in "passengers" table rows. As, well If I delete a row in "Passengers" table, if that row exists in 'Passengers_backup' table it should also get deleted. How can I acheive this?
Thanks in advance.
For solving your problem you need to use trigger with corresponding SQL statement for each action: insert, update, delete. As variant you can use something like this (Note, I left only two columns from your example for readability, so modify your trigger as you need):
create or replace trigger "PASSENGERS_BACKUP_TIUD"
after insert or update or delete on "PASSENGER"
for each row
begin
if inserting then
insert into "PASSENGER_BACKUP" (pb_id, pb_first_name)
values (:NEW.pb_id, :NEW.pb_first_name);
elsif updating then
update "PASSENGER_BACKUP"
set pb_id=:NEW.pb_id, pb_first_name=:NEW.pb_first_name
where pb_id=:NEW.pb_id;
elsif deleting then
delete from "PASSENGER_BACKUP"
where pb_id=:OLD.pb_id;
end if;
end;
Also you can see work of this trigger in action on SQL Fiddle.