Trigger doesn't let me update - mysql

Question

I have the following Trigger:
delimiter |
CREATE TRIGGER DES1actualizarConsultaR_update
AFTER UPDATE ON ranking
FOR EACH ROW
BEGIN
UPDATE player P,
(SELECT
J.player_id AS jugador_id,
SUM(ranking_points) AS PuntosTotales
FROM
player J
INNER JOIN ranking R ON R.player_id = NEW.player_id
GROUP BY J.player_id) AS TD
SET
P.totalPuntos = TD.PuntosTotales
WHERE
P.player_id = TD.jugador_id;
UPDATE player P,
(SELECT
J.player_id AS JnumUno, COUNT(*) AS NumVeces1
FROM
player J
INNER JOIN ranking R ON R.player_id = NEW.player_id
WHERE
R.ranking = '1'
GROUP BY J.player_id) AS TD
SET
P.vecesNum1 = TD.NumVeces1
WHERE
P.player_id = TD.JnumUno;
END |
I'am trying to execute this update:
UPDATE ranking
SET
ranking_points = (ranking_points + 10)
WHERE
player_id IN (SELECT
P.player_id
FROM
player P,
tourney T,
tmatch M
WHERE
T.tourney_name LIKE 'Madrid%'
AND T.tourney_date BETWEEN '2017-01-01' AND '2018-12-31'
AND (M.round = 'F' OR M.round = 'SF')
AND P.player_id = M.winner_id
AND M.tourney_id = T.tourney_id);
But I have this error:
Error Code: 1442. Can't update table 'player' in stored
function/trigger because it is already used by statement which invoked
this stored function/trigger.
How can I do the update query?
I´m using MYSQL.

Answer 1

It happens because you are have a jointure on the ranking table in the TRIGGER's UPDATE statement.
Even if you aren't updating the ranking table itself, MySQL doesn't like it.
You have to get around it by doing a stand-alone SELECT query first to compute the player's points, save those points in a variable, and then use it in your UPDATE of the player table, without referencing the ranking table
Here's the idea:
delimiter |
CREATE TRIGGER DES1actualizarConsultaR_update
AFTER UPDATE ON ranking
FOR EACH ROW
BEGIN
DECLARE vPuntosTotales INT;
DECLARE vNumVeces1 INT;
SELECT SUM(ranking_points) AS PuntosTotales INTO vPuntosTotales
FROM ranking
WHERE player_id = NEW.player_id;
UPDATE player SET totalPuntos = vPuntosTotales WHERE player_id = NEW.player_id;
-- NOT SURE IF THIS ONE IS CORRECT
SELECT COUNT(*) AS NumVeces1 INTO vNumVeces1
FROM ranking R
WHERE R.ranking = '1' AND R.player_id = NEW.player_id;
UPDATE player SET vecesNum1 = vNumVeces1 WHERE player_id = NEW.player_id;
END |
you should review my queries because I don't know exactly your table structure and I might be wrong in my SELECTs, especially in the second one