CREATE OR REPLACE TRIGGER INDEX_TBL_ID_AUTO
BEFORE INSERT ON date_info FOR EACH ROW
BEGIN
SELECT TO_CHAR(INDEX_TBL_SEQ.NEXTVAL) INTO :NEW.ID FROM DUAL;
END;

------解决思路----------------------
试了一下,把前面的空格都去掉编译就过去了,你前面应该不是空格吧,你删掉前面空白试试
BEGIN
SELECT to_char(INDEX_TBL_SEQ.NEXTVAL) INTO :NEW.ID FROM DUAL;
END;