設定時間格式
alter session set nls_date_format =
'dd-mon-yyyy hh:mi:ss'
select sysdate from dual;select current_date from dual;select
to_char
(sysdate,
'yyyy-mm-dd hh24:mi:ss'
)from dual;
select
to_date
('2017-09-22 00:00:00'
,'yyyy-mm-dd hh24:mi:ss'
) from dual;
select to_timestamp
(to_char
(sysdate,
'yyyy-mm-dd hh24:mi:ss'),
'yyyy-mm-dd hh24:mi:ssxff'
) from dual
過去一小時/一分鐘/一秒
select to_char
(to_date
('2019/06/04 14:43:51'
,'yyyy/mm/dd hh24:mi:ss')-
1/24,
'yyyy/mm/dd hh24:mi:ss'
) from dual
過去一天
select to_char
(sysdate -1,
'yyyy/mm/dd hh24:mi:ss'
) from dual
過去乙個月
select add_months
(sysdate,-1
) from dual
獲取時間的年
select
to_char
(sysdate,
'yyyy'
) as nowyear from dual;
獲取時間的月
select
to_char
(sysdate,
'mm'
) as nowmonth from dual;
獲取時間的日
select
to_char
(sysdate,
'dd'
) as nowday from dual;
獲取時間的時
select
to_char
(sysdate,
'hh24'
) as nowhour from dual;
獲取時間的分
select
to_char
(sysdate,
'mi'
) as nowminute from dual;
獲取時間的秒
select
to_char
(sysdate,
'ss'
) as nowsecond from dual;
獲取日期的星期幾
select
to_char
(sysdate,
'day'
) from dual;
兩個日期間的天數
select
floor
(sysdate -
to_date
('20020405'
,'yyyymmdd'
)) from dual;
select
to_date
(null) from dual;
select
add_months
(trunc
(sysdate,
'year'),
12)-trunc
(sysdate,
'year'
) from dual
select to_char
(sysdate,
'q') from dual;
select
to_char
(new_time
( sysdate,
'gmt'
,'est'),
'dd/mm/yyyy hh:mi:ss'
),sysdate from dual;
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