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;
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;