Hello, i'm trying to create check trigger between two columns. But get query error. Structure of columns is:
`start_t` (time) , `end_t` (time)
The goal is hours in `end_t` don't be same with `start_t` (e.g. 11:00 > 11:00)
Here is query code:
CREATE TRIGGER `check_times` BEFORE INSERT ON `schedule` FOR EACH ROW BEGIN DECLARE v_end_time time; SELECT end_t INTO v_end_time FROM `schedule` WHERE fn_stud = NEW.fn_stud; IF NEW.start_t > v_end_time THEN SET NEW.fn_stud = NULL; END IF; END;
MySQL says: #1064 - You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '' at line 1
Don't understand what is wrong. Can anyone explain? Thanks.
Answer Answered by Elena Stepanova in this comment.
Did you change the delimiter before executing the SQL above? Since your trigger consists of multiple statements and includes semicolon, you need to do it. See documentation for more detail.
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