sql 查找下周一/周二/周三/周四/周五/周六/周日的日期
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----------------------------Vertica-----------------------------------------------------------------------
select
Now() as Today,
next_day(Now(), 'Monday') as NextMonday, --returns the date of next Monday
next_day(Now(), 'Tuesday') as NextTuesday, --returns the date of next Tuesday
next_day(Now(), 'Wednesday') as NextWednesday, --returns the date of next Wednesday
next_day(Now(), 'Thursday') as NextThursday, --returns the date of next Thursday
next_day(Now(), 'Friday') as NextFriday, --returns the date of next Friday
next_day(Now(), 'Saturday') as NextSaturday, --returns the date of next Saturday
next_day(Now(), 'Sunday') as NextSunday --returns the date of next Sunday
Today |NextMonday |NextTuesday |NextWednesday |NextThursday |NextFriday |NextSaturday |NextSunday |
-----------|-----------|------------|--------------|-------------|-----------|-------------|-----------|
2017-11-23 |2017-11-27 |2017-11-28 |2017-11-29 |2017-11-30 |2017-11-24 |2017-11-25 |2017-11-26 |
---------------------------SQL Server---------------------------------------------------------------------
select
convert(date,getdate()) as Today,
-- 1=Sunday, 2=Monday, 3=Tuesday, 4=Wednesday, 5=Thursday, 6=Friday, 7=Sturday
convert(date, dateadd(day, 2, getdate() - datepart(dw, getdate())
+ case when datepart(dw, getdate()) < 2 then 0 else 7 end )) as NextMonday,
convert(date, dateadd(day, 3, getdate() - datepart(dw, getdate())
+ case when datepart(dw, getdate()) < 3 then 0 else 7 end )) as NextTuesday,
convert(date, dateadd(day, 4, getdate() - datepart(dw, getdate())
+ case when datepart(dw, getdate()) < 4 then 0 else 7 end )) as NextWednesday,
convert(date, dateadd(day, 5, getdate() - datepart(dw, getdate())
+ case when datepart(dw, getdate()) < 5 then 0 else 7 end )) as NextThursday,
convert(date, dateadd(day, 6, getdate() - datepart(dw, getdate())
+ case when datepart(dw, getdate()) < 6 then 0 else 7 end )) as NextFriday,
convert(date, dateadd(day, 7, getdate() - datepart(dw, getdate())
+ case when datepart(dw, getdate()) < 7 then 0 else 7 end )) as NextSaturday,
convert(date, dateadd(day, 1, getdate() - datepart(dw, getdate())
+ case when datepart(dw, getdate()) < 1 then 0 else 7 end )) as NextSunday
Today |NextMonday |NextTuesday |NextWednesday |NextThursday |NextFriday |NextSaturday |NextSunday |
-----------|-----------|------------|--------------|-------------|-----------|-------------|-----------|
2017-11-23 |2017-11-27 |2017-11-28 |2017-11-29 |2017-11-30 |2017-11-24 |2017-11-25 |2017-11-26 |
----------------------------MySQL--------------------------------------------------------------------------
select
date(Now()) as Today,
-- 1=Sunday, 2=Monday, 3=Tuesday, 4=Wednesday, 5=Thursday, 6=Friday, 7=Sturday
date(adddate(Now(), 2 - dayofweek(Now())
+ case when dayofweek(Now()) < 2 then 0 else 7 end )) as NextMonday,
date(adddate(Now(), 3 - dayofweek(Now())
+ case when dayofweek(Now()) < 3 then 0 else 7 end )) as NextTuesday,
date(adddate(Now(), 4 - dayofweek(Now())
+ case when dayofweek(Now()) < 4 then 0 else 7 end )) as NextWednesday,
date(adddate(Now(), 5 - dayofweek(Now())
+ case when dayofweek(Now()) < 5 then 0 else 7 end )) as NextThursday,
date(adddate(Now(), 6 - dayofweek(Now())
+ case when dayofweek(Now()) < 6 then 0 else 7 end )) as NextFriday,
date(adddate(Now(), 7 - dayofweek(Now())
+ case when dayofweek(Now()) < 7 then 0 else 7 end )) as NextSaturday,
date(adddate(Now(), 1 - dayofweek(Now())
+ case when dayofweek(Now()) < 1 then 0 else 7 end )) as NextSunday
Today |NextMonday |NextTuesday |NextWednesday |NextThursday |NextFriday |NextSaturday |NextSunday |
-----------|-----------|------------|--------------|-------------|-----------|-------------|-----------|
2017-11-23 |2017-11-27 |2017-11-28 |2017-11-29 |2017-11-30 |2017-11-24 |2017-11-25 |2017-11-26 |
---------------------------------PostgreSQL--------------------------------------------------------------------
select
-- 1=Monday, 2=Tuesday, 3=Wednesday, 4=Thursday, 5=Friday, 6=Saturday, 7=Sunday
---------------------------------------------------------------------------------------------------------------
-- timestamp + cast((num_of_days || ' day') as interval)
---OR
-- timestamp + "interval" (num_of_days || ' days')
----------------------------------------------------------------------------------------------------------------
Date(Now()) as Today,
Date(Now() + cast((1 - extract(dow from Now()))
+ (case when extract(dow from Now()) < 1 then 0 else 7 end) || ' day' as interval)) as NextMonday,
Date(Now() + cast((2 - extract(dow from Now()))
+ (case when extract(dow from Now()) < 2 then 0 else 7 end) || ' day' as interval)) as NextTuesday,
Date(Now() + cast((3 - extract(dow from Now()))
+ (case when extract(dow from Now()) < 3 then 0 else 7 end) || ' day' as interval)) as NextWednesday,
Date(Now() + cast((4 - extract(dow from Now()))
+ (case when extract(dow from Now()) < 4 then 0 else 7 end) || ' day' as interval)) as NextThursday,
Date(Now() + cast((5 - extract(dow from Now()))
+ (case when extract(dow from Now()) < 5 then 0 else 7 end) || ' day' as interval)) as NextFriday,
Date(Now() + cast((6 - extract(dow from Now()))
+ (case when extract(dow from Now()) < 6 then 0 else 7 end) || ' day' as interval)) as NextSaturday,
Date(Now() + cast((7 - extract(dow from Now()))
+ (case when extract(dow from Now()) < 7 then 0 else 7 end) || ' day' as interval)) as NextSunday
today |nextmonday |nexttuesday |nextwednesday |nextthursday |nextfriday |nextsaturday |nextsunday |
-----------|-----------|------------|--------------|-------------|-----------|-------------|-----------|
2017-11-23 |2017-11-27 |2017-11-28 |2017-11-29 |2017-11-30 |2017-11-24 |2017-11-25 |2017-11-26 |
--------------------------------------OR------------------------------------------------------------------
select
-- 1=Monday, 2=Tuesday, 3=Wednesday, 4=Thursday, 5=Friday, 6=Saturday, 7=Sunday
---------------------------------------------------------------------------------------------------------------
-- timestamp + cast((num_of_days || ' day') as interval)
---OR
-- timestamp + "interval" (num_of_days || ' days')
----------------------------------------------------------------------------------------------------------------
Date(Now()) as Today,
Date(Now() + "interval" ((1 - extract(dow from Now()))
+ (case when extract(dow from Now()) < 1 then 0 else 7 end) || ' day')) as NextMonday,
Date(Now() + "interval" ((2 - extract(dow from Now()))
+ (case when extract(dow from Now()) < 2 then 0 else 7 end) || ' day')) as NextTuesday,
Date(Now() + "interval" ((3 - extract(dow from Now()))
+ (case when extract(dow from Now()) < 3 then 0 else 7 end) || ' day')) as NextWednesday,
Date(Now() + "interval" ((4 - extract(dow from Now()))
+ (case when extract(dow from Now()) < 4 then 0 else 7 end) || ' day')) as NextThursday,
Date(Now() + "interval" ((5 - extract(dow from Now()))
+ (case when extract(dow from Now()) < 5 then 0 else 7 end) || ' day')) as NextFriday,
Date(Now() + "interval" ((6 - extract(dow from Now()))
+ (case when extract(dow from Now()) < 6 then 0 else 7 end) || ' day')) as NextSaturday,
Date(Now() + "interval" ((7 - extract(dow from Now()))
+ (case when extract(dow from Now()) < 7 then 0 else 7 end) || ' day')) as NextSunday
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