I'm new to the php mysql developpement, I want to make a trigger to be launched after I insert a row in the evolution
table. The trigger must take a value ( prixMisDaccord
) from another table ( inscription
) and reduce it value from the evolution
column prixAPaye
.
Here is what I tried and what I found on Stack Overflow:
DELIMITER $$
CREATE TRIGGER trg_rap
BEFORE INSERT ON evolution FOR EACH ROW
BEGIN
DECLARE pmd float;
-- Check BookingRequest table
SELECT prixMisDaccord
INTO @pmd
FROM inscription
WHERE inscription.idETD= 1;
SET NEW.resteAPaye = @pmd-NEW.prixPaye
WHERE idETD = 1;
END;
$$
DELIMITER `;
'i have a probleme from this line SELECT' - Is not the error I get, I do get an error on the set statement because you cannot apply a where clause to a set..There are other problems with your code and you don't seem to know the difference between user defined variables and declared variables see - How to declare a variable in MySQL? and temporary tables..so @pmd-NEW.prixPaye is just nonsense.
If you want more help read https://stackoverflow.com/help/how-to-ask and provide table definitions,sample data and desired outcome all as text in the question.
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