Question

The goal of this trigger is to insert old data per row into a table if the updated data per row does not equal the current data per row.

delimiter //
CREATE TRIGGER history BEFORE UPDATE ON table1

FOR EACH ROW
BEGIN
IF NEW.salePrice <> OLD.salePrice THEN

INSERT INTO history_price (modelNumber,salePrice)
        VALUES ('modelNumber','OLD.salePrice');

        ELSEIF NEW.salePrice = OLD.salePrice THEN
            SET NEW.salePrice = OLD.salePrice;

    END IF;

 END;//
 delimiter ;

All in all, this concept should be working, but the insert is not working. It is only inserting the actual text, not the values.

More specifically:

    INSERT INTO history_price (modelNumber,salePrice)
    VALUES 
        ('modelNumber','OLD.salePrice');

This part of my trigger literally inserts modelNumber, and OLD.salePrice into my history table if the updated values are not equal.

What is wrong with this query?

Answer 1

modelNumber and OLD.salePrice probably should not be in single quotes.