Oracle时间日期处理方法

https://www.cnblogs.com/plmm/p/7381496.html

 

1、用于截取年、月、日、时、分、秒

extract()函数

extract(year from sysdate) year ,extract(month from sysdate) month ,extract(day from sysdate) day,extract (hour from sysdate) hour,extract (minute from sysdate) minute,extract (second from sysdate) second

to_char()函数

select to_char(sysdate,'yyyy-mm-dd hh24:mi:ss') as nowTime from dual; //日期转化为字符串 select to_char(sysdate,'yyyy') as nowYear from dual; //获取时间的年 select to_char(sysdate,'mm') as nowMonth from dual; //获取时间的月 select to_char(sysdate,'dd') as nowDay from dual; //获取时间的日 select to_char(sysdate,'hh24') as nowHour from dual; //获取时间的时 select to_char(sysdate,'mi') as nowMinute from dual; //获取时间的分 select to_char(sysdate,'ss') as nowSecond from dual; //获取时间的秒

 

2、日期常用格式转换

to_char(sysdate,'YYYYMMDD W HH24:MI:SS')； //日期转成字符串

to_date('2004-05-07 13:23:44','yyyy-mm-dd hh24:mi:ss')； //字符串转成日期

TO_TIMESTAMP_TZ(to_char(SBSJ, 'yyyy-mm-dd hh24:mi:ss'),'yyyy-mm-dd hh24:mi:ss')； //日期类型 查询后时分秒不为零   to_date返回的 时分秒为零

转载于:https://www.cnblogs.com/ssbydk/p/9922363.html