I want to know can we make a Trigger on a table to update a column of newly inserted row
And that column data will be related by a formula to the same column in previous row
Please let me know....
sounds like you need a Trigger which is after insert. It should look something like this:
CREATE TRIGGER trigger_name AFTER INSERT ON table_name FOR EACH ROW trigger_body
Cheers
LK
Related
I have an after insert trigger that is supposed to update the field total in my table "test" where the id_cart is equal to new.id_cart. However my trigger is updating every single row in the table not only the one desired. I would like to know how can I modify my trigger so it only updates the row that I want.
This is my trigger.
CREATE DEFINER=`root`#`localhost` TRIGGER `update_total_test`
AFTER INSERT ON `test_product_quantity_cart`
FOR EACH ROW BEGIN
UPDATE test set total= (select sum(price_product) from test_product_quantity_cart where id_cart=new.id_cart);
END
So if the new row inserted in table "test_product_quantity_cart" has an new.id_cart=1, then only the row in table "test" with id_cart=1 should be uptated.
I think I am missing a "where" clause to indicate the update statement which rows it is suppossed to upate. However I do not know how to add that clause.
Thank you!
CREATE DEFINER=`root`#`localhost` TRIGGER `update_total_test`
AFTER INSERT ON `test_product_quantity_cart`
FOR EACH ROW
UPDATE test
JOIN ( SELECT id_cart, SUM(price_product) total
FROM test_product_quantity_cart
WHERE id_cart=NEW.id_cart ) value_for_update USING (id_cart)
SET test.total = value_for_update.total;
Is it possible to trigger the insert of all the columns for the NEW row? Basically, I want to make a copy of the newly insert record in another table but what having to specify all the columns.
Something like
DELIMITER $$
CREATE TRIGGER TestTrigger
AFTER INSERT
ON Table1 FOR EACH ROW
BEGIN
INSERT INTO `Table2` SELECT * FROM NEW;
END$$
DELIMITER ;
However this returns Table 'Database.NEW' doesn't exist whenever I try to insert a new row in Table1.
From MySQL documentation:
Within the trigger body, you can refer to columns in the subject table (the table associated with the trigger) by using the aliases OLD and NEW. OLD.col_name refers to a column of an existing row before it is updated or deleted. NEW.col_name refers to the column of a new row to be inserted or an existing row after it is updated.
Despite the time this question have been unanswered, you can SELECT all fields using primary key in source table if you have one.
CREATE TRIGGER replicated_table AFTER INSERT ON source_table FOR EACH ROW
BEGIN
INSERT INTO replicated_table SELECT * FROM source_table WHERE id=NEW.id;
END
Also, maybe you can prefer the use of REPLACE instead of INSERT to ensure the table will not stay out of sincronization.
when i make an after update trigger, follow with insert into another table why there are 2 values in another table that i've had inserted?
this is the query
DROP TRIGGER IF EXISTS uplb;CREATE DEFINER=root#localhost TRIGGER uplb AFTER UPDATE ON tb_bayar FOR EACH ROW
insert into tb_lbayar (id_bayar,id_penghuni,nama,kamar,periode,dateb,jumlah) select old.id_bayar,old.id_penghuni,old.nama,old.kamar,old.periode,old.dateb,new.jumlah
and here's the result in the table that i've inserted :
there are old and new values
and here im just need the new value one
thanks for the help
I am trying to write a MySQL trigger. I have two tables that look like this:
When a customer makes a purchase a new record is added to each table. I have added column ‘sku_copy’ to Table B, so it does not get populated when a new record is created.
When a new record is created, I want my trigger to copy the ‘sku’ field in Table A to the ‘sku_copy’ field in Table B. However, the problem I am having is how to structure the following condition in the trigger.
IF: ‘order_id’ in Table A matches ‘order_id’ in Table B. THEN: copy ‘sku’ from that Table A record to the record in Table B with the matching ‘order_id’. The data should be added to Table B ‘sku_copy'.
ELSE: don’t do anything.
Can someone show me how to write this into my trigger?
Thanks for any help you can give.
Try this but why do u think of using trigger for this ?
DELIMITER $$
CREATE TRIGGER trigger_name
AFTER INSERT ON tableA
FOR EACH ROW BEGIN
INSERT INTO tableB
SET sku_copy = OLD.sku,
order_id = OLD.order_id,
order = OLD.order;
END$$
DELIMITER ;
I want to post the trigger that was constructed with examples offered here and on another forum. Thanks to everyone who helped with this.
DELIMITER $$
CREATE TRIGGER sku_AfterInsert
AFTER INSERT ON uau3h_virtuemart_order_items
FOR EACH ROW BEGIN
UPDATE uau3h_virtuemart_orders
SET order_item_sku_copy = NEW.order_item_sku
WHERE virtuemart_order_id = NEW.virtuemart_order_id;
END$$;
DELIMITER ;
I've a table with 48 columns. So it's almost impossible (or let it be) to write a trigger like
CREATE TRIGGER tbl_trigger_update
AFTER update ON tbl1
FOR EACH ROW
update tbl2 set v1=NEW.v1, v2=NEW.v2, ... v48=NEW.v48 where id=old.id
but I dont want to write something like above.
I want to fire a trigger on update/insert on tbl1 to copy/update rows to tbl2
How to solve this issue ?
You can do something with the insert ... select syntax. This is the docs of the statement.