oracle: to_char,to_date

to_char()将日期转为字符串,  to_date()将字符串转为日期

SELECT TO_CHAR(SYSDATE,'YYYYMMDDHH24MISS') FROM DUAL;

-- 中文需要用双引号括起来
SELECT TO_CHAR(SYSDATE, 'YYYY"年"MM"月"DD"日"HH24:MI:SS') FROM DUAL;

SELECT TO_DATE('20070605113430','YYYY###MM###DD##HH24##MISS') FROM DUAL;