Related
I'm trying to insert yearly weekend details such as date, dayName into a SQL Server table using the following stored procedure
alter procedure usp_AddOfficeHolidays
#paramName NVARCHAR(max)
as
begin
DECLARE #Year AS INT,
#FirstDateOfYear DATETIME,
#LastDateOfYear DATETIME
-- You can change #year to any year you desire
SELECT #year = 2016
SELECT #FirstDateOfYear = DATEADD(yyyy, #Year - 1900, 0)
SELECT #LastDateOfYear = DATEADD(yyyy, #Year - 1900 + 1, 0)
-- Creating Query to Prepare Year Data
--declare dayN varchar(max)
if (select COUNT(*) from tblWeekSettings) < 1
begin
;WITH cte AS
(
SELECT
1 AS DayID,
#FirstDateOfYear AS FromDate,
DATENAME(dw, #FirstDateOfYear) AS Dayname
UNION ALL
SELECT
cte.DayID + 1 AS DayID,
DATEADD(d, 1 ,cte.FromDate),
DATENAME(dw, DATEADD(d, 1 ,cte.FromDate)) AS Dayname
FROM cte
WHERE DATEADD(d, 1, cte.FromDate) < #LastDateOfYear
)
SELECT FromDate AS Date, Dayname
FROM CTE
WHERE DayName IN (SELECT Param FROM dbo.fn_MVParam(#paramName,','))
OPTION (MaxRecursion 370)
end
else
begin
Select 'Exists'
end
end
and executing it using
exec usp_AddOfficeHolidays 'Saturday,Sunday'
which returns the following result
This works perfectly fine, BUT I have been unable to add/insert these details into the following table
I face the following error when I try to access the WEEKEND details by its alias CTE
The statement terminated. The maximum recursion 100 has been exhausted
before statement completion
Although I've added the clause
OPTION (MaxRecursion 370)
suggested by these links which I found on stack overflow
The maximum recursion 100 has been exhausted before statement completion
The statement terminated. The maximum recursion 100 has been exhausted before statement completion
EDIT
Basically i face the specified error when i try something like this
alter procedure usp_AddOfficeHolidays
#paramName NVARCHAR(max)
as
begin
----------------------------------------------------------
DECLARE #Year AS INT,
#FirstDateOfYear DATETIME,
#LastDateOfYear DATETIME
-- You can change #year to any year you desire
SELECT #year = 2016
SELECT #FirstDateOfYear = DATEADD(yyyy, #Year - 1900, 0)
SELECT #LastDateOfYear = DATEADD(yyyy, #Year - 1900 + 1, 0)
-- Creating Query to Prepare Year Data
--declare dayN varchar(max)
if (select COUNT(*) from tblWeekSettings) < 1
begin
;WITH cte AS (
SELECT 1 AS DayID,
#FirstDateOfYear AS FromDate,
DATENAME(dw, #FirstDateOfYear) AS Dayname
UNION ALL
SELECT cte.DayID + 1 AS DayID,
DATEADD(d, 1 ,cte.FromDate),
DATENAME(dw, DATEADD(d, 1 ,cte.FromDate)) AS Dayname
FROM cte
WHERE DATEADD(d,1,cte.FromDate) < #LastDateOfYear
)
SELECT FromDate AS Date, Dayname
FROM CTE
WHERE DayName IN(SELECT Param FROM dbo.fn_MVParam(#paramName,','))
insert into tblWeekSettings(DayNo,WeekDayName,Dates)
values('',Dayname,Date)
OPTION (MaxRecursion 370)
end
else
begin
Select 'Exists'
end
--select cte
-----------------------------------------------------------
end
Any sort of help here would really be appreciated! I just need to insert the data in my the specified table!
Thank you!
That's the error:
SELECT FromDate AS Date, Dayname
FROM CTE
WHERE DayName IN(SELECT Param FROM dbo.fn_MVParam(#paramName,','))
I split this code to make you understand what code actually is working in this case:
insert into tblWeekSettings(DayNo,WeekDayName,Dates)
values('',Dayname,Date)
OPTION (MaxRecursion 370)
OPTION (MAX RECURSION) now belongs to single insert statement. Which is standalone, totally not related to CTE.
You actually need this, I suppose:
;with CTE (...)
insert into tblWeekSettings(DayNo,WeekDayName,Dates)
SELECT FromDate AS Date, Dayname
FROM CTE
WHERE DayName IN(SELECT Param FROM dbo.fn_MVParam(#paramName,','))
OPTION (MaxRecursion 370)
but there are three columns in target table whilst your select has only two columns. So you'll have to update your select.
Some tips about INSERT-SELECT:
http://www.w3schools.com/sql/sql_insert_into_select.asp
this code:
insert into tblWeekSettings(DayNo,WeekDayName,Dates)
values('',Dayname,Date)
does not have any source for inserting. This is not valid code - you don't have here any Dayname,Date variables - they are not even referenced with # as variables. It's totally not valid code.
For anyone who face the following issues
Getting Weeked details i.e. DayName, Date
Inserting into a Table
This stored procedure would do the trick.
alter procedure usp_AddOfficeHolidays
#paramName NVARCHAR(max)
as
begin
----------------------------------------------------------
DECLARE #Year AS INT,
#FirstDateOfYear DATETIME,
#LastDateOfYear DATETIME
-- You can change #year to any year you desire
SELECT #year = 2016
SELECT #FirstDateOfYear = DATEADD(yyyy, #Year - 1900, 0)
SELECT #LastDateOfYear = DATEADD(yyyy, #Year - 1900 + 1, 0)
-- Creating Query to Prepare Year Data
--declare dayN varchar(max)
if (select COUNT(*) from tblWeekSettings) < 1
begin
;WITH cte AS (
SELECT 1 AS DayID,
#FirstDateOfYear AS FromDate,
DATENAME(dw, #FirstDateOfYear) AS Dayname
UNION ALL
SELECT cte.DayID + 1 AS DayID,
DATEADD(d, 1 ,cte.FromDate),
DATENAME(dw, DATEADD(d, 1 ,cte.FromDate)) AS Dayname
FROM cte
WHERE DATEADD(d,1,cte.FromDate) < #LastDateOfYear
)
insert into tblWeekSettings(DayNo,Dates,WeekDayName)
SELECT '',FromDate AS Date, Dayname
FROM CTE WHERE DayName IN(SELECT Param FROM dbo.fn_MVParam(#paramName,','))
OPTION (MaxRecursion 30000)
end
else
begin
Select 'Exists'
end
--select cte
-----------------------------------------------------------
end
Plus this article could really be helpful.
http://www.w3schools.com/sql/sql_insert_into_select.asp
Try this, I hope this is useful for you.
alter procedure usp_AddOfficeHolidays
#paramName NVARCHAR(max)
as
begin
----------------------------------------------------------
DECLARE #Year AS INT,#DayNo as int=1,
#FirstDateOfYear DATETIME,
#LastDateOfYear DATETIME
-- You can change #year to any year you desire
SELECT #year = 2016
SELECT #FirstDateOfYear = DATEADD(yyyy, #Year - 1900, 0)
SELECT #LastDateOfYear = DATEADD(yyyy, #Year - 1900 + 1, 0)
Select getdate() DateOfYear into #tbl where 1=0
-- Creating Query to Prepare Year Data
--declare dayN varchar(max)
if (select COUNT(*) from tblWeekSettings) < 1
begin
while (#FirstDateOfYear< #LastDateOfYear)
begin
Insert Into #tbl (DayNo,DateOfYear) values (#DayNo,#FirstDateOfYear)
set #FirstDateOfYear+=1
set #DayNo+=1;
End
Insert Into tblWeekSettings (DayNo,WeekDayName,Dates)
SELECT DayNo,DATENAME(dw, DateOfYear) Name,DateOfYear AS Date
FROM #tbl
WHERE DATENAME(dw, DateOfYear) IN(SELECT Param FROM dbo.fn_MVParam(#paramName,','))
end
else
begin
Select 'Exists'
end
--select cte
-----------------------------------------------------------
end
For simplicity lets assume that I have a view with three fields
date_in (date)
Container (varchar)
date_out (date)
Now, the container is IN if the date_in is lesser or equal to given date and date_out is null or greater than given date. Now I am trying to count the containers for given time period. In pseudocode between two values STARTDATE and ENDDATE it would be something like
FOR X =STARTDATE, X<= ENDDADE, X++ {
if date_in <=X and date_out>x
count (container)
}
or closer to SQL:
declare #startdate date,
#d date;
set #startdate = '1/01/2014'
set #d = #startdate
"FOR on the #d variable would go here" {
select #d as SNAP_DATE, count (container) where date_in <#d
and (date_out is null or date_out> #d)
}
It might be simple - I guess I could make a new table and manually do multiple SELECT INTO (and later query from this new table) but its not very elegant solution.
Edit: just to precise - in the end I'd like to have something like:
DATE Count
1/02/2014 10
2/02/2014 15
...
7/03/2014 19
You could do this procedurally as follows:
Use a while loop to loop from start to end date.
Use a table variable to store each date-count pair.
Select from the table variable to get the summarised result.
declare #start date = '1/01/2014'
declare #end date = '7/03/2014'
declare #tbl table(Date date, Count int)
while(#start < #end)
begin
insert into #tbl
select #start, count(*)
from your_view
where (in_date < #start)
and ((out_date is null) or (out_date > #start))
set #start = dateadd(day, 1, #start)
end
select * from #tbl
You might be able to do something like the following. It uses a numbers table, which can be a real or derived table. It contains rows of integers. You need a table that begins with 0 and has enough values to cover your date range. Check here for more information on a numbers table.
DECLARE #StartDate DATE = '1/2/2014'
DECLARE #EndDate DATE = '1/4/2014'
SELECT DATEADD(d, n.num, #StartDate) AS DATE, COUNT(*) AS COUNT
FROM Numbers n
JOIN MyView mv ON mv.date_in < DATEADD(d, n.num, #StartDate)
AND (mv.date_out IS NULL OR mv.date_out > DATEADD(d, n.num, #StartDate))
WHERE DATEADD(d, n.num, #StartDate) BETWEEN #StartDate AND #EndDate
GROUP BY DATEADD(d, n.num, #StartDate)
ORDER BY DATEADD(d, n.num, #StartDate)
The numbers in the numbers table are converted to the list of dates between the date range. Each date is joined to your view based on the criteria you need.
I need to make a temporary table that holds of range of dates, as well as a couple of columns that hold placeholder values (0) for future use. The dates I need are the first day of each month between $startDate and $endDate where these variables can be several years apart.
My original sql statement looked like this:
select dbo.FirstOfMonth(InsertDate) as Month, 0 as Trials, 0 as Sales
into #dates
from customer
group by dbo.FirstOfMonth(InsertDate)
"FirstOfMonth" is a user-defined function I made that pretty much does what it says, returning the first day of the month for the provided date with the time at exactly midnight.
This produced almost exactly what I needed until I discovered there were occasionally gaps in my dates where I had a few months were there were no records insert dates. Since my result must still have the missing months I need a different approach.
I have added the following declarations to the stored procedure anticipating their need for the range of the dates I need ...
declare $startDate set $startDate = select min(InsertDate) from customer
declare $endDate set $endDate = select max(InsertDate) from customer
... but I have no idea what to do from here.
I know this question is similar to this question but, quite frankly, that answer is over my head (I don't often work with SQL and when I do it tends to be on older versions of SQL Server) and there are a few minor differences that are throwing me off.
I needed something similar, but all DAYS instead of all MONTHS.
Using the code from MatBailie as a starting point, here's the SQL for creating a permanent table with all dates from 2000-01-01 to 2099-12-31:
CREATE TABLE _Dates (
d DATE,
PRIMARY KEY (d)
)
DECLARE #dIncr DATE = '2000-01-01'
DECLARE #dEnd DATE = '2100-01-01'
WHILE ( #dIncr < #dEnd )
BEGIN
INSERT INTO _Dates (d) VALUES( #dIncr )
SELECT #dIncr = DATEADD(DAY, 1, #dIncr )
END
This will quickly populate a table with 170 years worth of dates.
CREATE TABLE CalendarMonths (
date DATETIME,
PRIMARY KEY (date)
)
DECLARE
#basedate DATETIME,
#offset INT
SELECT
#basedate = '01 Jan 2000',
#offset = 1
WHILE (#offset < 2048)
BEGIN
INSERT INTO CalendarMonths SELECT DATEADD(MONTH, #offset, date) FROM CalendarMonths
SELECT #offset = #offset + #offset
END
You can then use it by LEFT joining on to that table, for the range of dates you require.
I would probably use a Calendar table. Create a permanent table in your database and fill it with all of the dates. Even if you covered a 100 year range, the table would still only have ~36,525 rows in it.
CREATE TABLE dbo.Calendar (
calendar_date DATETIME NOT NULL,
is_weekend BIT NOT NULL,
is_holiday BIT NOT NULL,
CONSTRAINT PK_Calendar PRIMARY KEY CLUSTERED (calendar_date)
)
Once the table is created, just populate it once in a loop, so that it's always out there and available to you.
Your query then could be something like this:
SELECT
C.calendar_date,
0 AS trials,
0 AS sales
FROM
dbo.Calendar C
WHERE
C.calendar_date BETWEEN #start_date AND #end_date AND
DAY(C.calendar_date) = 1
You can join in the Customers table however you need to, outer joining on FirstOfMonth(InsertDate) = C.calendar_date if that's what you want.
You can also include a column for day_of_month if you want which would avoid the overhead of calling the DAY() function, but that's fairly trivial, so it probably doesn't matter one way or another.
This of course will not work in SQL-Server 2000 but in a modern database where you don't want to create a permanent table. You can use a table variable instead creating a table so you can left join the data try this. Change the DAY to HOUR etc to change the increment type.
declare #CalendarMonths table (date DATETIME, PRIMARY KEY (date)
)
DECLARE
#basedate DATETIME,
#offset INT
SELECT
#basedate = '01 Jan 2014',
#offset = 1
INSERT INTO #CalendarMonths SELECT #basedate
WHILE ( DATEADD(DAY, #offset, #basedate) < CURRENT_TIMESTAMP)
BEGIN
INSERT INTO #CalendarMonths SELECT DATEADD(HOUR, #offset, date) FROM #CalendarMonths where DATEADD(DAY, #offset, date) < CURRENT_TIMESTAMP
SELECT #offset = #offset + #offset
END
A starting point of a useful kludge to specify a range or specific list of dates:
SELECT *
FROM
(SELECT CONVERT(DateTime,'2017-1-1')+number AS [Date]
FROM master..spt_values WHERE type='P' AND number<370) AS DatesList
WHERE DatesList.Date IN ('2017-1-1','2017-4-14','2017-4-17','2017-12-25','2017-12-26')
You can get 0 to 2047 out of master..spt_values WHERE type='P', so that's five and a half year's worth of dates if you need it!
Tested below and it works, though it's a bit convoluted.
I assigned arbitrary values to the dates for the test.
DECLARE #SD smalldatetime,
#ED smalldatetime,
#FD smalldatetime,
#LD smalldatetime,
#Mct int,
#currct int = 0
SET #SD = '1/15/2011'
SET #ED = '2/02/2012'
SET #FD = (DATEADD(dd, -1*(Datepart(dd, #SD)-1), #sd))
SET #LD = (DATEADD(dd, -1*(Datepart(dd, #ED)-1), #ED))
SET #Mct = DATEDIFF(mm, #FD, #LD)
CREATE TABLE #MyTempTable (FoM smalldatetime, Trials int, Sales money)
WHILE #currct <= #Mct
BEGIN
INSERT INTO #MyTempTable (FoM, Trials, Sales)
VALUES
(DATEADD(MM, #currct, #FD), 0, 0)
SET #currct = #currct + 1
END
SELECT * FROM #MyTempTable
DROP TABLE #MyTempTable
For SQL Server 2000, this stackoverflow post looks promising for a way to temporarily generate dates calculated off of a start and end date. It's not exactly the same but quite similar. This post has a very in-depth answer on truncating dates, if needed.
In case anyone stumbles on this question and is working in PostgreSQL instead of SQL Server 2000, here is how you might do it there...
PostgreSQL has a nifty series generating function. For your example, you could use this series of all days instead of generating an entire calendar table, and then do groupings and matchups from there.
SELECT current_date + s.a AS dates FROM generate_series(0,14,7) AS s(a);
dates
------------
2004-02-05
2004-02-12
2004-02-19
(3 rows)
SELECT * FROM generate_series('2008-03-01 00:00'::timestamp,
'2008-03-04 12:00', '10 hours');
generate_series
---------------------
2008-03-01 00:00:00
2008-03-01 10:00:00
2008-03-01 20:00:00
2008-03-02 06:00:00
2008-03-02 16:00:00
2008-03-03 02:00:00
2008-03-03 12:00:00
2008-03-03 22:00:00
2008-03-04 08:00:00
(9 rows)
I would also look into date_trunc from PostgreSQL using 'month' for the truncator field to maybe refactor your original query to easily match with a date_trunc version of the calendar series.
select top (datediff(D,#start,#end)) dateadd(D,id-1,#start)
from BIG_TABLE_WITH_NO_JUMPS_IN_ID
declare #start datetime
set #start = '2016-09-01'
declare #end datetime
set #end = '2016-09-30'
create table #Date
(
table_id int identity(1,1) NOT NULL,
counterDate datetime NULL
);
insert into #Date select top (datediff(D,#start,#end)) NULL from SOME_TABLE
update #Date set counterDate = dateadd(D,table_id - 1, #start)
The code above should populate the table with all the dates between the start and end. You would then just join on this table to get all of the dates needed. If you only needed a certain day of each month, you could dateadd a month instead.
SELECT P.Id
, DATEADD ( DD, -P.Id, P.Date ) AS Date
FROM (SELECT TOP 1000 ROW_NUMBER () OVER (ORDER BY (SELECT NULL)) AS Id, CAST(GETDATE () AS DATE) AS Date FROM master.dbo.spt_values) AS P
This query returns a table calendar for the last 1000 days or so. It can be put in a temporary or other table.
Create a table variable containing a date for each month in a year:
declare #months table (reportMonth date, PRIMARY KEY (reportMonth));
declare #start date = '2018', #month int = 0; -- base 0 month
while (#month < 12)
begin
insert into #months select dateAdd(month, #month, #start);
select #month = #month + 1;
end
--verify
select * from #months;
This is by far the quickest method I have found (much quicker than inserting rows 1 by 1 in a WHILE loop):
DECLARE #startDate DATE = '1900-01-01'
DECLARE #endDate DATE = '2050-01-01'
SELECT DATEADD(DAY, sequenceNumber, #startDate) AS TheDate
INTO #TheDates
FROM (
SELECT ones.n + 10*tens.n + 100*hundreds.n + 1000*thousands.n + 10000*tenthousands.n AS sequenceNumber
FROM
(VALUES(0),(1),(2),(3),(4),(5),(6),(7),(8),(9)) ones(n),
(VALUES(0),(1),(2),(3),(4),(5),(6),(7),(8),(9)) tens(n),
(VALUES(0),(1),(2),(3),(4),(5),(6),(7),(8),(9)) hundreds(n),
(VALUES(0),(1),(2),(3),(4),(5),(6),(7),(8),(9)) thousands(n),
(VALUES(0),(1),(2),(3),(4),(5),(6),(7),(8),(9)) tenthousands(n)
WHERE ones.n + 10*tens.n + 100*hundreds.n + 1000*thousands.n + 10000*tenthousands.n <= DATEDIFF(day, #startDate, #endDate)
) theNumbers
SELECT *
FROM #TheDates
ORDER BY TheDate
The recursive answer:
DECLARE #startDate AS date = '20220315';
DECLARE #endDate AS date = '20230316'; -- inclusive
WITH cte_minutes(dt)
AS (
SELECT
DATEFROMPARTS(YEAR(#startDate), MONTH(#startDate), 1)
UNION ALL
SELECT
DATEADD(month, 1, dt)
FROM
cte_minutes
WHERE DATEADD(month, 1, dt) < #endDate
)
SELECT
dt
into #dates
FROM
cte_minutes
WHERE
dt >= #startDate
AND
dt <= #endDate
OPTION (MAXRECURSION 2000);
DROP TABLE dbo.#dates
Supposing that I wanted to write table valued function in SQL that returns a table with the first day of every month between the argument dates, what is the simplest way to do this?
For example fnFirstOfMonths('10/31/10', '2/17/11') would return a one-column table with 11/1/10, 12/1/10, 1/1/11, and 2/1/11 as the elements.
My first instinct is just to use a while loop and repeatedly insert first days of months until I get to before the start date. It seems like there should be a more elegant way to do this though.
Thanks for any help you can provide.
Something like this would work without being inside a function:
DECLARE #LowerDate DATE
SET #LowerDate = GETDATE()
DECLARE #UpperLimit DATE
SET #UpperLimit = '20111231'
;WITH Firsts AS
(
SELECT
DATEADD(DAY, -1 * DAY(#LowerDate) + 1, #LowerDate) AS 'FirstOfMonth'
UNION ALL
SELECT
DATEADD(MONTH, 1, f.FirstOfMonth) AS 'FirstOfMonth'
FROM
Firsts f
WHERE
DATEADD(MONTH, 1, f.FirstOfMonth) <= #UpperLimit
)
SELECT *
FROM Firsts
It uses a thing called CTE (Common Table Expression) - available in SQL Server 2005 and up and other database systems.
In this case, I start the recursive CTE by determining the first of the month for the #LowerDate date specified, and then I iterate adding one month to the previous first of month, until the upper limit is reached.
Or if you want to package it up in a stored function, you can do so, too:
CREATE FUNCTION dbo.GetFirstOfMonth(#LowerLimit DATE, #UpperLimit DATE)
RETURNS TABLE
AS
RETURN
WITH Firsts AS
(
SELECT
DATEADD(DAY, -1 * DAY(#LowerLimit) + 1, #LowerLimit) AS 'FirstOfMonth'
UNION ALL
SELECT
DATEADD(MONTH, 1, f.FirstOfMonth) AS 'FirstOfMonth'
FROM
Firsts f
WHERE
DATEADD(MONTH, 1, f.FirstOfMonth) <= #UpperLimit
)
SELECT * FROM Firsts
and then call it like this:
SELECT * FROM dbo.GetFirstOfMonth('20100522', '20100831')
to get an output like this:
FirstOfMonth
2010-05-01
2010-06-01
2010-07-01
2010-08-01
PS: by using the DATE datatype - which is present in SQL Server 2008 and newer - I fixed the two "bugs" that Richard commented about. If you're on SQL Server 2005, you'll have to use DATETIME instead - and deal with the fact you're getting a time portion, too.
create function dbo.fnFirstOfMonths(#d1 datetime, #d2 datetime)
returns table as return
select dateadd(m,datediff(m,0,#d1)+v.number,0) as FirstDay
from master..spt_values v
where v.type='P' and v.number between 0 and datediff(m, #d1, #d2)
and dateadd(m,datediff(m,0,#d1)+v.number,0) between #d1 and #d2
GO
Notes
master..spt_values is a source for general purpose sequence numbers in SQL Server
dateadd(m, datediff(m is a technique for working out the first day of month for any date
+v.number is used to increase it by one month each time
0 and datediff(m, #d1, #d2) this condition gives us all the numbers we need to generate a first-of-month date for each month between #d1 and #d2, inclusive of both months
and dateadd(m,datediff(m,0,#d1)+v.number,0) between #d1 and #d2 the final filter to verify that the first-of-month date generated is between #d1 and #d2
Performance comparison against marc_s's code
Summary
8220 ms (CTE)
4173 ms (master..spt_values)
Test
declare #t table (dt datetime)
declare #d datetime
declare #i int
set nocount on
set #d = GETDATE()
set #i = 0
while #i < 10000
begin
insert #t select * from dbo.getfirstofmonth('20090102', '20100506')
delete #t
set #i = #i + 1
end
print datediff(ms, #d, getdate())
set #d = GETDATE()
set #i = 0
while #i < 10000
begin
insert #t select * from dbo.fnfirstofmonths('20090102', '20100506')
delete #t
set #i = #i + 1
end
print datediff(ms, #d, getdate())
Performante
It will loop just between the months involved (4 times in the example):
set dateformat mdy;
declare #date1 smalldatetime,#date2 smalldatetime,#i int
set #date1= '10-31-2010'
set #date2= '02-17-2011'
set #i=1
while(#i<=DATEDIFF(mm,#date1,#date2))
begin
select convert(smalldatetime,CONVERT(varchar(6),DATEADD(mm,#i,#date1),112)+'01',112)
set #i=#i+1
end
I realize this isn't a function, but I'm going to throw this into the mix anyway.
select cal_date from calendar
where day_of_month = 1
and cal_date between '2011-01-01' and '2012-01-01'
This calendar table runs on a PostgreSQL server at work. I'll port it to SQL Server tonight, and run some speed comparisons. (Why? Because this stuff is fun, that's why.)
Just in case anybody is still reading this ...
I cannot imaging that any of the aforementioned functions is faster than this:
declare #DatFirst date = '20101031', #DatLast date = '21110217';
declare #DatFirstOfFirstMonth date = dateadd(day,1-day(#DatFirst),#DatFirst);
select DatFirstOfMonth = dateadd(month,n,#DatFirstOfFirstMonth)
from (
select top (datediff(month,#DatFirstOfFirstMonth,#DatLast)+1)
n=row_number() over (order by (select 1))-1
from (values (1),(1),(1),(1),(1),(1),(1),(1)) a (n)
cross join (values (1),(1),(1),(1),(1),(1),(1),(1)) b (n)
cross join (values (1),(1),(1),(1),(1),(1),(1),(1)) c (n)
cross join (values (1),(1),(1),(1),(1),(1),(1),(1)) d (n)
) x
i have a table of data that i want to select out via stored proc such that users can connect a MS excel front end to it and use the raw data as a source to graph.
The problem with the raw data of the table is there exist gaps in the dates because if there is no data for a given day (there is no records with that date) then when users try to graph it it creates problems.
I want too update my stored proc to left outer join to a temp table of dates so that the right side will come in as nulls that i can cast to zero's for them to have a simple plotting experience.
how do i best generate a one field table of dates between a start and end date?
In SQL Server 2005 and up, you can use something like this (a Common Table Expression CTE) to do this:
DECLARE #DateFrom DATETIME
SET #DateFrom = '2011-01-01'
DECLARE #DateTo DATETIME
SET #DateTo = '2011-01-10'
;WITH DateRanges AS
(
SELECT #DateFrom AS 'DateValue'
UNION ALL
SELECT DATEADD(DAY, 1, DateValue)
FROM DateRanges
WHERE DateValue < #DateTo
)
SELECT * FROM DateRanges
You could LEFT OUTER JOIN this CTE against your table and return the result.
Another way to do it is with a memory table. It won't choke due to recursion limitations like some of the above solutions.
DECLARE #dates AS TABLE ([Date] date);
DECLARE #date date = {d '2010-10-01'};
DECLARE #endDate date = {d '2010-11-01'};
while (#date < #endDate)
BEGIN
INSERT INTO #dates VALUES (#date);
SET #date = dateadd(DAY, 1, #date)
END
SELECT * FROM #dates;
SQL Fiddle
One way would be with a CTE:
with cte_dates as (
select cast('20110119' as datetime) as [date]
union all
select dateadd(dd, 1, [date])
from cte_dates
where dateadd(dd, 1, [date]) <= '20111231'
)
select [date], YourColumn
from cte_dates
left join YourTable
on ...
option (maxrecursion 0);