MySQL Trigger Update with select from another table

Question

Just learning about triggers and I\'m created the following trigger;

CREATE TRIGGER `incremental_before_ins_tr` BEFORE INSERT ON incremental`
FOR EACH ROW
BE         


        

Answer 1

I've actually managed to solve this myself. Here is the updated code

CREATE TRIGGER `incremental_before_ins_tr` BEFORE INSERT ON `incremental`
FOR EACH ROW
BEGIN
SET NEW.source = (Select source from crm_record
where crm_record.msisdn = new.msisdn order by dat DESC limit 1);
END;

I needed to specify the table name prior to the column value on line 5.