PostgreSQL创建触发器的时候报错，

CREATE FUNCTION jins_xfupdate_func() RETURNS TRIGGER AS
$$
DECLARE
BEGIN
IF NEW.js_成绩01>=60 AND OLD. js_成绩01<60 THEN
UPDATE "jins_学生01" set js_已修学分总数01= js_已修学分总数01+(SELECT js_学分01 FROM "jins_课程01" WHERE js_课程编号01=NEW.js_课程编号01)
WHERE "jins_学生01".js_学号01=NEW. js_学号01;
RETURN NEW;
ELSE RETURN NULL;
END IF;
END
$$LANGUAGE PLPGSQL;

CREATE TRIGGER jins_TG学分统计 trigger
AFTER UPDATE ON jins_学习01"
FOR EACH ROW
EXECUTE PROCEDURE jins_xfupdate_func();