oracle时间戳函数及相关操作

精确到秒：
insert into table_name(usrname,logintime) values('xxxx',to_timestamp(to_char(sysdate,'YYYY-MM-DD HH24:MI:SS'),'YYYY-MM-DD HH24:MI:SS'));

精确到毫秒：
insert into table_name(usrname,logintime) values('yyyy',to_timestamp(to_char(systimestamp,'YYYY-MM-DD HH24:MI:SS.FF'),'YYYY-MM-DD HH24:MI:SS.FF'));

其他:

select to_timestamp(to_char(systimestamp,'YYYY-MM-DD HH24:MI:SS.FF'),'YYYY-MM-DD HH24:MI:SS.FF') from dual;
select SYSDATE from dual;
select to_char(sysdate,'yyyy-mm-dd hh24:mi:ss') as nowTime from dual;
select CURRENT_TIMESTAMP,LOCALTIMESTAMP,SYSTIMESTAMP from dual;