mysql-error-1442

I have a tree (nested categories) stored as follows: CREATE TABLE `category` ( `category_id` int(10) unsigned NOT NULL AUTO_INCREMENT, `category_name` varchar(100) NOT NULL, `parent_id` int(10) unsigned DEFAULT NULL, PRIMARY KEY (`category_id`), UNIQUE KEY `category_name_UNIQUE` (`category_name`,`parent_id`), KEY `fk_category_category1` (`parent_id`,`category_id`), CONSTRAINT `fk_category_category1` FOREIGN KEY (`parent_id`) REFERENCES `category` (`category_id`) ON DELETE SET NULL ON UPDATE CASCADE ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_spanish_ci I need to feed my client-side

I ran into a problem as I tried to create two TIMESTAMP columns in my database. One called created and one called updated . I figured it would be easy to set the default value of both to CURRENT_TIMESTAMP and then ON UPDATE CURRENT_TIMESTAMP for the updated column. But for some reason MySQL means that's a bad idea... so I have been looking for ways to do this without having to set one of them in the insert query. I found one way by using a trigger in this answer , but I keep getting errors. I just managed to actually create the trigger, but now I get errors when I try to insert new rows

well i have looked for a lot of places on the internet for the cause of the mysql error #1442 which says Can't update table 'unlucky_table' in stored function/trigger because it is already used by statement which invoked this stored function/trigger some say that this is a bug in mysql or a feature that it doesnt provide. MySQL triggers can't manipulate the table they are assigned to. All other major DBMS support this feature so hopefully MySQL will add this support soon. Some claim that this is due to recursive behavior when you insert a record mysql is doing some lock stuff. you can't insert

How can I update table's column in a trigger after update on the same table? Here's the trigger: CREATE TRIGGER upd_total_votes AFTER UPDATE ON products_score FOR EACH ROW UPDATE products_score SET products_score.votes_total = (SELECT (votes_1 + votes_2 + votes_3 + votes_4 + votes_5) FROM products_score WHERE id = new.id) Now when I update the table like UPDATE products_score SET votes_1 = 5 WHERE id = 0 this doesn't work, as I get the following: #1442 - Can't update table 'products_score' in stored function/trigger because it is already used by statement which invoked this stored function

I want to set up a trigger so that if on an update the prediction field is = 3 then the trigger changes the value to 4 and saves it in the database. The trigger is below. For some reason I keep getting an error saying: #1442 - Can't update table 'tzanalytic\_forecast\_cached' in stored function/trigger because it is already used by statement which invoked this stored function/trigger. Is this set up the right way? delimiter $$ CREATE TRIGGER no_BoW BEFORE UPDATE ON t FOR EACH ROW BEGIN set @prediction = new.prediction; UPDATE t SET t.prediction = (SELECT IF(@prediction = '3', '4', @prediction)