I'm trying to create a trigger to give "SumBeforeTaxes(from 'order')" a value.
The "SumBeforeTaxes" is itemQuantity(from 'order_item') x price ('from itemsinstock').
So if one has ordered 3 items at 10 USD each, the "SumBeforeTaxes" would be 3 x 10 (30 in total). Likewise, if one has ordered 3 items at 10 USD each AND 2 items at 15 each, the "SumBeforeTaxes" should be 3x10 + 2x15 (60 in total).
Here's what I've tried so far - but I keep getting syntax errors. I'm also not sure my triggers (despite the syntax errors) are correct.
1st attempt:
CREATE DEFINER = CURRENT_USER TRIGGER `orderdb`.`order_AFTER_INSERT`
AFTER INSERT ON `order_item` FOR EACH ROW
BEGIN
SET getItemPrice = (SELECT Price FROM itemsinstock);
INSERT orderdb.'order'
SET SumBeforeTax = itemQuantity * getItemPrice;
END
2nd attempt:
CREATE DEFINER = CURRENT_USER TRIGGER `orderdb`.`order_AFTER_INSERT`
AFTER INSERT ON `order_item` FOR EACH ROW
BEGIN
SET getItemPrice = (SELECT Price FROM itemsinstock);
INSERT INTO orderdb.'order' (SumBeforeTax) VALUES (new.itemQuantity * getItemPrice);
END
3rd attempt:
CREATE DEFINER = CURRENT_USER TRIGGER `orderdb`.`order_AFTER_INSERT`
AFTER INSERT ON `order_item` FOR EACH ROW
BEGIN
declare getItemPrice DOUBLE;
SET getItemPrice = (SELECT Price FROM itemsinstock WHERE ItemID = new.itemID);
INSERT INTO orderdb.'order'(SumBeforeTax) VALUES (itemQuantity * getItemPrice);
END
Can I get a little help on this one?
order is a reserve word in MySQL and thus you need to escape it like below using backtique for your INSERT statement.
INSERT INTO orderdb.`order`(SumBeforeTax) VALUES (itemQuantity * getItemPrice);
For any syntactical clarification refer Documentation On CREATE TRIGGER Syntax.
You might want to change your code like below in that case using an UPDATE statement rather:
BEGIN
declare getItemPrice DOUBLE;
SELECT Price INTO getItemPrice FROM itemsinstock WHERE ItemID = new.itemID;
UPDATE orderdb.`order` SET SumBeforeTax = new.itemQuantity * getItemPrice
WHERE OrderID = 101;
Related
I have 3 tables
tbl_payments(pay_id,date,amount,description,-------)
tbl_pay_trans(pay_id,trans_id)
tbl_transactions(trans_id,trans_date,trans_amount,trans_description,-----)
'tbl_transaction' has the same data from the 'tbl_payments' along with some other values. To maintain the relationship between the two tables I use 'tbl_pay_trans'. What I want to do is, when an update done on tbl_payments(amount,description) the same changes need to do in tbl_transactions(trans_amount,trans_description). I wrote a trigger to do that, but it dose not update the tbl_transaction table values as it supposed to.
My trigger is
DELIMITER $$
CREATE TRIGGER update_trans
AFTER UPDATE on tbl_payments
FOR EACH ROW
BEGIN
DECLARE new_amount VARCHAR(50);
DECLARE new_description TEXT;
DECLARE new_pay_id,new_trans_id INT;
SET new_pay_id = OLD.pay_id;
SET new_amount = OLD.amount;
SET new_description = OLD.description;
SELECT trans_id INTO new_trans_id FROM tbl_pay_trans WHERE pay_id = new_pay_id;
UPDATE tbl_transactions SET
trans_amount = new_amount,
trans_description = new_description
WHERE trans_id = new_trans_id;
END$$
DELIMITER ;
Please someone help me to figure out what I did wrong.
It's not updating because you are using OLD on the amount and description columns where you need to use NEW i.e.
SET new_amount = NEW.amount;
SET new_description = NEW.description;
OLD refers to the column value before the update occurred in tbl_payments. See the manual.
I have a table that holds a bunch of values for an order, I can do basic calculations on it until I get to a percentage. Right now I have my query as follows
declare #MyNumber decimal
set #MyNumber = (select SalesTax from [OrderHeader] where OrderHeaderID = 20)
select
sum(o.MaterialPrice) as "MatPrice",
sum(o.LaborPrice) as "LaborPrice",
sum(o.MaterialCost) as "MaterialCost",
sum(isnull(o.MaterialPrice,0)) - sum(isnull(o.MaterialCost,0)) - sum(isnull(o.LaborPrice,0)) * #MyNumber as "RESULT"
from [OrderDetail] o
inner join [OrderHeader] oh on oh.OrderHeaderID = o.OrderHeaderID
where o.OrderHeaderID = 20
PLEASE CHANGE AT LEAST NAZOV
DELIMITER $$
CREATE TRIGGER `nazov` BEFORE UPDATE
ON test
FOR EACH ROW BEGIN
SET NEW.OLD_TEXT=OLD.TEXT;
END $$
DELIMITER;
I just started working with SQL and have been working with MySQL.I am trying to write a stored procedure that will take each value from my buyPrice column in my products table, and store each value into a variable. I then want it to multiply this variable by the sales tax and then take each result and place it into my empty sales_tax column. I would like to populate the whole column with the sales tax for each item. When I execute this method I get some error saying the productCode doesn't have a default value. What is the proper way to write this? I know this isn't the most efficient way of doing this task, just trying to practice.
DELIMITER //
CREATE PROCEDURE nFirstProcedure()
BEGIN
DECLARE IdValue, counter, holdValue, result INT DEFAULT 0;
DECLARE holdName VARCHAR(30);
SET counter = 1;
WHILE counter < ( SELECT COUNT(*) FROM products)
DO
SET holdValue = (SELECT buyPrice FROM products WHERE sales_tax = null);
SET result = (holdValue * 0.08);
INSERT INTO products (sales_tax) VALUES (result);
END WHILE;
END//
DELIMITER ;
You should not do this with a loop. Just use update:
update products
set sales_tax = buyPrice * 0.08
where sales_tax is null;
I have a MYSQL table and two of the fields are called Rate_per_unit and Cost. First I want the field Rate_per_unit to populate itself from another table called SHD_TEACHER then I want the field COST to populate itself also from RATE in SHD_TEACHER and multiplies by UNITS.
I have the following code which is giving me an error:
CREATE TRIGGER RATE_PER_UNIT_1
BEFORE INSERT ON SHD_SCHEDULE
FOR EACH ROW
SET NEW.RATE_PER_UNIT =
(
SELECT RATE
FROM SHD_TEACHER
WHERE TEACHERID = NEW.TEACHER_ID
LIMIT 1
)
SET NEW.COST = (
SELECT RATE
FROM SHD_TEACHER
WHERE TEACHERID = NEW.TEACHER_ID
) * UNITS
Any help please?
thanks
using your syntax, I would expect a delimiter statement and a begin/end block. So, try this:
DELIMITER $$
CREATE TRIGGER RATE_PER_UNIT_1
BEFORE INSERT ON SHD_SCHEDULE
FOR EACH ROW
BEGIN
SET NEW.RATE_PER_UNIT =
(
SELECT RATE
FROM SHD_TEACHER t
WHERE t.TEACHERID = NEW.TEACHER_ID
LIMIT 1
)
SET NEW.COST = (
SELECT t.RATE
FROM SHD_TEACHER t
WHERE t.TEACHERID = NEW.TEACHER_ID
) * NEW.UNITS
END $$
DELIMITER ;
You have a limit 1 in the first subquery, suggesting that there might be multiple matches. If so, you will get a run-time error in the second. Also, UNITS is just hanging out there, all alone. I assumed it is in the NEW record.
Here is another way to write this:
DELIMITER $$
CREATE TRIGGER RATE_PER_UNIT_1
BEFORE INSERT ON SHD_SCHEDULE
FOR EACH ROW
BEGIN
SELECT NEW.RATE_PER_UNIT := t.RATE, NEW.COST := t.RATE * NEW.UNITS
FROM (SELECT t.*
FROM SHD_TEACHER t
WHERE t.TEACHERID = NEW.TEACHER_ID
LIMIT 1
) t
END $$
DELIMITER ;
I have a table which contains two columns
1.Clanid
2.Active
My problem is that i dont want any value in Clanid column to be inserted in this table if this value is already in Clanid column and Active for that value is 1.
For example
Clanid Active
1 1
2 1
3 0
Now it should not be possible to insert a record with Clanid=1 and Active=1 but i can insert Clanid=3 and Active=1 as this record is not there.
Try this:
delimiter //
create trigger unique_clanid
before insert on mytable
for each row
begin
if new.active and exists (
select * from mytable
where clanid = new.clanid
and active) then
signal sqlstate '02000' set MESSAGE_TEXT = 'Duplicate ClanID';
end if;
end//
delimiter ;
I think you should handle in your app level, but you want to handle in DB lavel, you can write trigger check it
you can check count record ( where Clanid = #param and Active =1)
if count > 1 : rollback
I am not available mysql to test , i just can describe my solution as following ( i;m not sure the syntax correct, it is too long time i don't write trigger in mysql)
CREATE TRIGGER test BEFORE INSERT ON table_name
FOR EACH ROW
BEGIN
DECLARE newClanId integer;
DECLARE counts integer;
Set #newClanId = NEW.Clanid;
Set #count := (SELECT count (*) FROM table_name
WHERE Clanid = #newClanId and Active =1)
IF #count > 1 THEN ROLLBACK;
END;