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trigger with dynamic column name
Posted by: LEANDRO AREVALO
Date: November 02, 2020 06:29AM

Good morning to all

At this moment I have the need to create a trigger, but according to the value returned by the month (coldate) function, it updates a specific column in another table.

I explain:

Table orders
order_id INT auto_increment
client_id INT
order_date DATE
city_id INT

Table summary_month_orders
consecutive INT auto_increment
client_id INT
month1 INT
month2 INT
month3 INT
month4 INT
.....
month12 INT

I need to create a TRIGGER that when inserting a record in the orders summary table adds 1 to the corresponding month field of the month_summary_orders table.
Which means that if I add an order that has the date '2020-10-01', +1 must be added to the month October from the summary_orders_month table.

I try in the following way but so far without success

delimiter //
CREATE TRIGGER add_order AFTER INSERT ON orders
FOR EACH ROW
BEGIN
DECLARE mthdb CHAR(5);
SELECT CONCAT("month",month(NEW.order_date)) INTO mthdb;

UPDATE summary_month_ordersSET mthdb=mthdb +1 WHERE client_id =NEW.client_id

END IF;
END;//
delimiter;

It returns syntax error

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trigger with dynamic column name
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