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Find the first day of previuos/next week
----------------------------SQL Server-----------------------------------------------------------------------------------
select
----------------------------Mon-Sun week-------------------------------------------------
convert(date, getdate()) as Today,
datepart(dw, getdate()) as Weekday,
case ---------------previous week--------------------------------------------------------
when datepart(dw, getdate()) = 1 then convert(date, dateadd(day, -13, getdate()))
when datepart(dw, getdate()) = 2 then convert(date, dateadd(day, -7, getdate()))
when datepart(dw, getdate()) = 3 then convert(date, dateadd(day, -8, getdate()))
when datepart(dw, getdate()) = 4 then convert(date, dateadd(day, -9, getdate()))
when datepart(dw, getdate()) = 5 then convert(date, dateadd(day, -10, getdate()))
when datepart(dw, getdate()) = 6 then convert(date, dateadd(day, -11, getdate()))
when datepart(dw, getdate()) = 7 then convert(date, dateadd(day, -12, getdate()))
end as FirstDayofPreviousWeek,
case ---------------next week--------------------------------------------------------
when datepart(dw, getdate()) = 1 then convert(date, dateadd(day, +1, getdate()))
when datepart(dw, getdate()) = 2 then convert(date, dateadd(day, +7, getdate()))
when datepart(dw, getdate()) = 3 then convert(date, dateadd(day, +6, getdate()))
when datepart(dw, getdate()) = 4 then convert(date, dateadd(day, +5, getdate()))
when datepart(dw, getdate()) = 5 then convert(date, dateadd(day, +4, getdate()))
when datepart(dw, getdate()) = 6 then convert(date, dateadd(day, +3, getdate()))
when datepart(dw, getdate()) = 7 then convert(date, dateadd(day, +2, getdate()))
end as FirstDayofNextWeek,
convert(date, convert(varchar(7), dateadd(month, -1, getdate()) , 120) + '-01') as FirstDayofPreviousMonth,
convert(date, convert(varchar(7), dateadd(month, +1, getdate()) , 120) + '-01') as FirstDayofNextMonth
Today |Weekday |FirstDayofPreviousWeek |FirstDayofNextWeek |FirstDayofPreviousMonth |FirstDayofNextMonth |
-----------|--------|-----------------------|-------------------|------------------------|--------------------|
2017-11-15 |4 |2017-11-06 |2017-11-20 |2017-10-01 |2017-12-01 |
# --------------------------MySQL------------------------------------------------------------------------------------
select
Date(Now()) as Today,
case #----------------------previous week---------------------------------
when weekday(Now()) = 0 then date(date_add(Now(), interval -7 day))
when weekday(Now()) = 1 then date(date_add(Now(), interval -8 day))
when weekday(Now()) = 2 then date(date_add(Now(), interval -9 day))
when weekday(Now()) = 3 then date(date_add(Now(), interval -10 day))
when weekday(Now()) = 4 then date(date_add(Now(), interval -11 day))
when weekday(Now()) = 5 then date(date_add(Now(), interval -12 day))
when weekday(Now()) = 6 then date(date_add(Now(), interval -13 day))
end as FirstDayofPreviousWeek,
case #----------------------next week---------------------------------
when weekday(Now()) = 0 then date(date_add(Now(), interval +7 day))
when weekday(Now()) = 1 then date(date_add(Now(), interval +6 day))
when weekday(Now()) = 2 then date(date_add(Now(), interval +5 day))
when weekday(Now()) = 3 then date(date_add(Now(), interval +4 day))
when weekday(Now()) = 4 then date(date_add(Now(), interval +3 day))
when weekday(Now()) = 5 then date(date_add(Now(), interval +2 day))
when weekday(Now()) = 6 then date(date_add(Now(), interval +1 day))
end as FirstDayofNextWeek,
date_format(date_add(Now(), interval -1 month), '%Y-%m-01') as FirstDayofPreviousMonth,
date_format(date_add(Now(), interval +1 month), '%Y-%m-01') as FirstDayofNextMonth
Today |FirstDayofPreviousWeek |FirstDayofNextWeek |FirstDayofPreviousMonth |FirstDayofNextMonth |
-----------|-----------------------|-------------------|------------------------|--------------------|
2017-11-15 |2017-11-06 |2017-11-20 |2017-10-01 |2017-12-01 |
------------------------------PostgreSQL--------------------------------------------------------------------
select
Date(Now()) as Today,
Date(date_trunc('week', Now() - interval '7 day')) as FirstDayOfPreviousWeek,
Date(date_trunc('month', Now() - interval '1 month')) as FirstDayofPrevioustMonth,
Date(date_trunc('year', Now() - interval '1 year')) as FirstDayOfPreviousYear,
Date(date_trunc('week', Now() + interval '7 day')) as FirstDayOfNextWeek,
Date(date_trunc('month', Now() + interval '1 month')) as FirstDayofNextMonth,
Date(date_trunc('year', Now() + interval '1 year')) as FirstDayOfNextYear
today |firstdayofpreviousweek |firstdayofprevioustmonth |firstdayofpreviousyear
-----------|-----------------------|-------------------------|-----------------------
2017-11-15 |2017-11-06 |2017-10-01 |2016-01-01
|firstdayofnextweek |firstdayofnextmonth |firstdayofnextyear |
|-------------------|--------------------|-------------------|
|2017-11-20 |2017-12-01 |2018-01-01 |
------------------------------Vertica-----------------------------------------------------------------------
select
Date(Now()) as Today,
Date(date_trunc('week', timestampadd('week', -1, Now()))) as FirstDayOfPreviousWeek,
Date(date_trunc('month', timestampadd('month', -1, Now()))) as FirstDayofPrevioustMonth,
Date(date_trunc('year', timestampadd('year', -1, Now()))) as FirstDayOfPreviousYear,
Date(date_trunc('week', timestampadd('week', +1, Now()))) as FirstDayOfNextWeek,
Date(date_trunc('month', timestampadd('month', +1, Now()))) as FirstDayofNextMonth,
Date(date_trunc('year', timestampadd('year', +1, Now()))) as FirstDayOfNextYear
Today |FirstDayofPreviousWeek |FirstDayofNextWeek |FirstDayofPreviousMonth |FirstDayofNextMonth |
-----------|-----------------------|-------------------|------------------------|--------------------|
2017-11-15 |2017-11-06 |2017-11-20 |2017-10-01 |2017-12-01 |
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