ORACLE常用時間查詢

–取當前日期的本月末

select to_char(last_day(trunc(to_date(

20200903
,'yyyymmdd'),
'month'))
,'yyyymmdd'
) 本月末 from dual;

select to_char(last_day(trunc(to_date(

20200903
,'yyyymmdd'),
'mm'))
,'yyyymmdd'
) 本月末 from dual;

select to_char(last_day(add_months(to_date(

20200903
,'yyyymmdd'),
-1))
,'yyyymmdd'
) 上個月末 from dual;

select to_char(trunc(to_date(

20200903
,'yyyymmdd'),
'mm')-
1,'yyyymmdd'
) 上個月末 from dual;

select to_char(last_day(add_months(to_date(

20200903
,'yyyymmdd'),
1)),
'yyyymmdd'
) 下個月末 from dual;

select to_char(trunc(to_date(

20200903
,'yyyymmdd'),
'mm'),
'yyyymmdd'
) 本月初 from dual;

select to_char(trunc(add_months(to_date(

20200903
,'yyyymmdd'),
-1),
'mm'),
'yyyymmdd'
) 上個月初 from dual;

select to_char(trunc(add_months(to_date(

20200903
,'yyyymmdd'),
1),'mm'),
'yyyymmdd'
) 下個月初 from dual;

select to_char(add_months(to_date(

20200903
,'yyyymmdd'),
-1),
'yyyymmdd'
) 上個月的今天 from dual;

select to_char(add_months(to_date(

20200903
,'yyyymmdd'),
-12),
'yyyymmdd'
) 去年今天 from dual;

select to_char(add_months(trunc(to_date(

20200903
,'yyyymmdd'),
'yyyy'),
12)-1
,'yyyymmdd'
) 今年末 from dual;

select to_char(trunc(to_date(

20200903
,'yyyymmdd'),
'yy')-
1,'yyyymmdd'
) 去年年末 from dual;

select to_char(trunc(to_date(

20200903
,'yyyymmdd'),
'yy')-
interval
'1'year
,'yyyymmdd'
) 去年年初 from dual;

select to_char(to_date(

20200903
,'yyyymmdd'),
'yyyymmdd'
) 當前日期 from dual;

select  to_char(to_date(

20200903
,'yyyymmdd')-
1,'yyyymmdd'
) 昨天 from dual;

select  to_char(to_date(

20200903
,'yyyymmdd')+
1,'yyyymmdd'
) 明天 from dual;

select to_char(systimestamp,

'yyyymmddhhmmssff5'
) 當前毫秒5
from dual;

select to_char(to_date(

20200401
,'yyyymmdd')+
level-1
,'yyyymmdd'
) dt from dual connect
bylevel
<= to_char(last_day(to_date(
20200401
,'yyyymmdd'))
,'dd'
);

select to_char(to_date(to_char(trunc(to_date(

20190203
,'yyyymmdd'),
'mm'),
'yyyymmdd'),
'yyyymmdd')+
level-1
,'yyyymmdd'
) dt from dual connect
bylevel
<= to_char(last_day(to_date(
20190203
,'yyyymmdd'))
,'dd'
);

select to_char(to_date(to_char(trunc(to_date(

20190203
,'yyyymmdd'),
'mm'),
'yyyymmdd'),
'yyyymmdd')+
level-1
,'yyyymmdd'
) dt from dual connect
bylevel
<= to_char(to_date(
20190203
,'yyyymmdd'),
'dd'
);

select

*from
(select
level
as week,  
decode(sign(
5-decode(to_char(pm.sd,
'd')
,'1'
,'7'
,to_char(pm.sd,
'd')))
,-1,  
next_day(pm.sd+
(level-1
)*7,
2),next_day(pm.sd+
(level-1
)*7-
7,2)
)as 當周第一天,  
decode(sign(
5-decode(to_char(pm.sd,
'd')
,'1'
,'7'
,to_char(pm.sd,
'd')))
,-1,  
next_day(pm.sd+
(level-1
)*7,
2),next_day(pm.sd+
(level-1
)*7-
7,2)
)+6as 當周最後一天  
from dual d  
left
join
(select trunc(to_date(
'2021-01-01'
,'yyyy-mm-dd'),
'yyyy'
)as sd from dual) pm on1=
1connect
bylevel
<=
53)dd 
where dd.week =
33;

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