我在我的 mysql 触发器中声明了一些变量
DELIMITER //
CREATE TRIGGER lestrigger
AFTER INSERT ON examinations
FOR EACH ROW
BEGIN
DECLARE the_last_inserted_id INT ;
DECLARE the_class_id INT;
DECLARE the_year_id INT;
SET the_last_inserted_id = LAST_INSERT_ID();
SET the_class_id = select examination_class_id from examinations where examination_id = the_last_inserted_id;
SET the_year_id = select examination_class_year_id from examinations where examination_id = the_last_inserted_id;
insert into examination_data (ed_cs_id,ed_examination_id) select cs_id from class_students where cs_class_id = the_class_id AND cs_year_id = the_year_id,the_last_inserted_id;
END
//
DELIMITER ;
但我不断收到此错误
/* SQL 错误 (1064): 你的 SQL 语法有错误;检查与您的 MySQL 服务器版本相对应的手册以获取正确的语法,以便在第 10 行的“从考试中选择考试类别 ID 中使用考试类别 ID = the_last_in” */
我在语法上使用变量的方式是否正确?