在ORACLE APEX中写了脚本，它说：“您已请求运行包含未知语句的脚本。请删除以下语句。” 怎么了？
CREATE OR REPLACE SEQUENCE deptno_seq INCREMENT BY 1 START WITH 50 MAXVALUE 90; /
CREATE OR REPLACE TRIGGER task1_trigger
BEFORE INSERT ON dept
FOR EACH ROW
BEGIN
IF :new.deptno IS NULL THEN
:new.deptno := deptno_seq.nextval;
END IF;
IF :new.loc IS NULL THEN
:new.loc := 'MOSCOW';
END IF;
END; /
INSERT INTO dept (DNAME) VALUES('MARKETING'); /
INSERT INTO dept (DNAME, LOC) VALUES('SPORT', 'LONDON'); /
SELECT * FROM dept; /
ALTER TRIGGER task1_trigger DISABLE; /
