SQL - How to get a complete month calendar table - sql

Question

I need to generate a report that will show 7 Columns Monday to Sunday and 5 Rows, just like a normal month calendar:
I need the dates in a list table, so the desire table result should look like this:
That way my report designer will automatically create a view like above.
The above table result should be generated on the fly with no need of any database table because after this I will have to left join the dates to one of my db tables so I can populate other kind of information that I will use to display in my report for each day.
Any clue?

Answer 1

SQL Fiddle for arbitrary sequence of dates, no tables required.
http://sqlfiddle.com/#!3/9eecb7/275
DECLARE #dtStartDate datetime
DECLARE #dtEndDate datetime
SET #dtStartDate = '2015-05-01'
SET #dtEndDate = '2015-05-31'
SELECT
CASE DATEPART(weekday, T.DateVal)
WHEN 1 THEN 'Sunday'
WHEN 2 THEN 'Monday'
WHEN 3 THEN 'Tuesday'
WHEN 4 THEN 'Wednesday'
WHEN 5 THEN 'Thursday'
WHEN 6 THEN 'Friday'
WHEN 7 THEN 'Saturday'
END AS WeekDay,
DATEPART(day, T.DateVal) AS [Date],
DATEPART(month, T.DateVal) AS [Month],
DATEPART(year, T.DateVal) AS [Year]
FROM
(
SELECT
DATEADD(day, SEQ.SeqValue, #dtStartDate) DateVal
FROM
(
SELECT
(HUNDREDS.SeqValue + TENS.SeqValue + ONES.SeqValue) SeqValue
FROM
(
SELECT 0 SeqValue
UNION ALL
SELECT 1 SeqValue
UNION ALL
SELECT 2 SeqValue
UNION ALL
SELECT 3 SeqValue
UNION ALL
SELECT 4 SeqValue
UNION ALL
SELECT 5 SeqValue
UNION ALL
SELECT 6 SeqValue
UNION ALL
SELECT 7 SeqValue
UNION ALL
SELECT 8 SeqValue
UNION ALL
SELECT 9 SeqValue
) ONES
CROSS JOIN
(
SELECT 0 SeqValue
UNION ALL
SELECT 10 SeqValue
UNION ALL
SELECT 20 SeqValue
UNION ALL
SELECT 30 SeqValue
UNION ALL
SELECT 40 SeqValue
UNION ALL
SELECT 50 SeqValue
UNION ALL
SELECT 60 SeqValue
UNION ALL
SELECT 70 SeqValue
UNION ALL
SELECT 80 SeqValue
UNION ALL
SELECT 90 SeqValue
) TENS
CROSS JOIN
(
SELECT 0 SeqValue
UNION ALL
SELECT 100 SeqValue
UNION ALL
SELECT 200 SeqValue
UNION ALL
SELECT 300 SeqValue
UNION ALL
SELECT 400 SeqValue
UNION ALL
SELECT 500 SeqValue
UNION ALL
SELECT 600 SeqValue
UNION ALL
SELECT 700 SeqValue
UNION ALL
SELECT 800 SeqValue
UNION ALL
SELECT 900 SeqValue
) HUNDREDS
) SEQ
) T
WHERE
T.DateVal <= #dtEndDate
ORDER BY
T.DateVal ASC

Answer 2

Edited to add beginning blank days. Same logic can be used to append blank days if necessary.
declare #begindate date = '5-1-2015'
declare #enddate date = '6-1-2015'
create table MyCal (MyWeekday varchar(10), MyDate varchar(2), MyMonth varchar(10), MyYear int)
declare #DaysFromMonday int =
case datepart(weekday, #begindate)
when 1 then 6
else datepart(weekday, #begindate) - 2
end
declare #datecounter date = dateadd(dd, -1* #daysFromMonday, #begindate)
while #datecounter < #enddate
begin
insert into MyCal values (
datename(weekday, #datecounter)
, case when #datecounter < #begindate then '' else cast(datepart(DD, #datecounter) as varchar) end
, datename(month, #datecounter)
, datepart(YYYY, #datecounter)
)
set #datecounter = dateadd(day, 1, #datecounter)
end
select * from MyCal

Answer 3

You can use this piece of code.
Replace the #tmp table with a proper table name that you prefer.
declare #start_date datetime, #end_date datetime, #cur_date datetime
set #start_date = '2015-05-01'
set #end_date = '2016-04-30'
set #cur_date = #start_date
create table #tmp
(weekday varchar(10),
date int,
month varchar(10),
year int)
while #cur_date <= #end_date
begin
insert into #tmp
select datename(dw, #cur_date), datepart(day, #cur_date), datename(month, #cur_date), datepart(year, #cur_date)
set #cur_date = dateadd(dd, 1, #cur_date)
end
select * from #tmp
drop table #tmp

Answer 4

Try this version - You will have to run one month at a time. I've also added the blanks if the last day of the month is not a Sunday e.g. Try he month of August 2015.
declare #start_date datetime, #end_date datetime, #cur_date datetime
set #start_date = '2015-05-01'
set #end_date = '2015-05-31'
set #cur_date = #start_date
create table #tmp
(weekday varchar(10),
date varchar(2),
month varchar(10),
year int)
while datepart(dw, #cur_date) > 2
begin
insert into #tmp
select datename(dw, dateadd(dd, -(datepart(dw, #cur_date) - 2), #start_date)), '', datename(month, #start_date), datepart(year, #start_date)
set #cur_date = dateadd(dd, -1, #cur_date)
end
set #cur_date = #start_date
while #cur_date <= #end_date
begin
insert into #tmp
select datename(dw, #cur_date), datepart(day, #cur_date), datename(month, #cur_date), datepart(year, #cur_date)
set #cur_date = dateadd(dd, 1, #cur_date)
end
set #cur_date = #end_date
while datepart(dw, #cur_date) > 1
begin
insert into #tmp
select datename(dw, dateadd(dd, 1, #cur_date)), '', datename(month, #end_date), datepart(year, #end_date)
set #cur_date = dateadd(dd, 1, #cur_date)
end
select * from #tmp
drop table #tmp
Hope this helps.

Answer 5

Here is an alternative method using multiple CTE queries and SQL EMONTH end of month function with DATENAME SQL function
declare #date as date = dateadd(mm,0,getdate())
;with monthdates as (
SELECT dateadd(dd,1,EOMONTH(dateadd(mm,-1,#date))) firstofmonth, EOMONTH (#date) lastofmonth
), calc as (
select
firstofmonth, lastofmonth,
dateadd(dd,
-1 * case when datepart(dw,firstofmonth)-2 >= 0 then datepart(dw,firstofmonth)-2 else datepart(dw,firstofmonth)+7-2 end,
firstofmonth
) firstofcalendar,
datediff(WEEK,
dateadd(dd,
-1 * case when datepart(dw,firstofmonth)-2 >= 0 then datepart(dw,firstofmonth)-2 else datepart(dw,firstofmonth)+7-2 end,
firstofmonth
),
lastofmonth) weekcount
from monthdates
), calendar1 as (
select
firstofcalendar,
firstofmonth,
lastofmonth,
case when dateadd(dd, weekcount * 7 - 1, firstofcalendar) = lastofmonth then lastofmonth
else
dateadd(dd, (weekcount+1) * 7 - 1, firstofcalendar)
end as lastofcalendar
from calc
), calendar as (
select
datename(dw,date) dayname,
case when month(date) = month(#date) then cast(cast(date as date) as nvarchar) else '' end as date
from calendar1
cross apply [dbo].[DateTable](firstofcalendar, lastofcalendar)
)
select *, datename(mm,#date) month, datepart(yyyy,#date) year from calendar

Answer 6

Something like this should do you. It should work for any start-of-week you choose: you just need to set datefirst N on your connection/query to suit. If you want the week to start on Monday, use set datefirst 1.
Here's the query:
set datefirst = 1 -- start the week on Monday
declare #month date = '1 May 2015'
;with
month_days as
(
select dd = -5 union all
select dd = -4 union all
select dd = -3 union all
select dd = -2 union all
select dd = -1 union all
select dd = 0 union all
select dd = 1 union all
select dd = 2 union all
select dd = 3 union all
select dd = 4 union all
select dd = 5 union all
select dd = 6 union all
select dd = 7 union all
select dd = 8 union all
select dd = 9 union all
select dd = 10 union all
select dd = 11 union all
select dd = 12 union all
select dd = 13 union all
select dd = 14 union all
select dd = 15 union all
select dd = 16 union all
select dd = 17 union all
select dd = 18 union all
select dd = 19 union all
select dd = 20 union all
select dd = 21 union all
select dd = 22 union all
select dd = 23 union all
select dd = 24 union all
select dd = 25 union all
select dd = 26 union all
select dd = 27 union all
select dd = 28 union all
select dd = 29 union all
select dd = 30 union all
select dd = 31 union all
select dd = 32 union all
select dd = 33 union all
select dd = 34 union all
select dd = 35 union all
select dd = 36 union all
select dd = 37
),
calendar as
(
select * ,
yyyymmdd = dateadd(day,t.dd-1,#month)
from month_days t
)
select Day_Of_Week = datename(weekday,c.yyyymmdd ) ,
DD = datepart(day , c.yyyymmdd ) ,
MM = datepart(month , c.yyyymmdd ) ,
YYYY = datepart(year , c.yyyymmdd )
from calendar c
where datediff(month,#month,c.yyyymmdd) = 0 -- current month
OR ( datediff(month,#month,c.yyyymmdd) < 0 -- previous month
and datepart(weekday,c.yyyymmdd) < datepart(weekday,#month) ) -- ...to pad out the first week
OR ( datediff(month,#month,c.yyyymmdd) > 0 -- next month
and datepart(weekday,c.yyyymmdd) >= datepart(weekday,dateadd(month,1,#month)) -- ... to pad out the last week
)
order by c.yyyymmdd
Running the above query produces the expected
Day_Of_Week DD MM YYYY
=========== == == ====
Monday 27 4 2015
Tuesday 28 4 2015
Wednesday 29 4 2015
Thursday 30 4 2015
Friday 1 5 2015
Saturday 2 5 2015
Sunday 3 5 2015
Monday 4 5 2015
Tuesday 5 5 2015
Wednesday 6 5 2015
Thursday 7 5 2015
Friday 8 5 2015
Saturday 9 5 2015
Sunday 10 5 2015
Monday 11 5 2015
Tuesday 12 5 2015
Wednesday 13 5 2015
Thursday 14 5 2015
Friday 15 5 2015
Saturday 16 5 2015
Sunday 17 5 2015
Monday 18 5 2015
Tuesday 19 5 2015
Wednesday 20 5 2015
Thursday 21 5 2015
Friday 22 5 2015
Saturday 23 5 2015
Sunday 24 5 2015
Monday 25 5 2015
Tuesday 26 5 2015
Wednesday 27 5 2015
Thursday 28 5 2015
Friday 29 5 2015
Saturday 30 5 2015
Sunday 31 5 2015
Monday 1 6 2015
Tuesday 2 6 2015
Wednesday 3 6 2015
Thursday 4 6 2015
Friday 5 6 2015
Saturday 6 6 2015