Comments on: SQL SERVER – UDF – User Defined Function – Get Number of Days in Month

By: yoga

yoga — Wed, 16 Nov 2011 19:20:25 +0000

yoga..

How I create UDF for already created table column.
Must any one answer me…

By: ankit

ankit — Wed, 31 Aug 2011 06:50:19 +0000

Get Month Name using UDF

CREATE FUNCTION dbo.GetMonthName(@MonthNumber tinyint)
RETURNS varchar(15)
AS
BEGIN
DECLARE @MonthName varchar(15)
SET @MonthName = DateName( Month , DateAdd( Month , @MonthNumber , 0 ) – 1 )
RETURN @MonthName
END

Execute it: SELECT dbo.GetMonthName(3)

By: SQL SERVER – Interview Questions and Answers – Frequently Asked Questions – Day 4 of 31 Journey to SQLAuthority

Mon, 04 Jul 2011 01:31:53 +0000

[...] A multi-statement table-value user-defined function returns a table, and it is also an exceptional alternative to a view as the function can support multiple T-SQL statements to build the final result where the view is limited to a single SELECT statement. Also, the ability to pass parameters into a T-SQL select command or a group of them gives us the capability to in essence create a parameterized, non-updateable view of the data in the underlying tables. Within the create function command, you must define the table structure that is being returned. After creating this type of user-defined function, It can be used in the FROM clause of a T-SQL command unlike the behavior encountered while using a stored procedure which can also return record sets. (Read here for example) [...]

By: sandeep

sandeep — Sat, 18 Sep 2010 00:54:51 +0000

Hello Friends,
This site was very informative, i have an issue, would be glad if you can help me.
The issue that i have to write a user defined funtion

format of dtActivityStartDate/dtActivityFinishDate: 2010-09-17 14:50:51.150 Note: Both dtActivityStartDate/dtActivityFinishDate

vcActivityName = Process Request

usdFuncTimeCalc (vcActivityName,dtActivityStartDate, dtActivityFinishDate)

i need to calculate time elasped for that type of activity following are the rules:

(If Process Request is the activity)

Working Days: Monday through Saturday
Hours of Operation: 9AM – 5PM

only working hours of day need to the counted like for example if it is sep 15 11 Am is dtActivityStartDate & Sep 17 is dtActivityFinishDate is 10 Am. then time elapsed is 11am to 5pm on sep 15 , 9 to 5 on sep 16 & 9 to 10 on sep 17 so total should be
6+ 8 + 1 = 15 hours + minutes.

format of date time: 2010-09-17 14:50:51.150

vcActivityName = Process Request

By: Imran Mohammed

Imran Mohammed — Thu, 22 Jul 2010 00:33:52 +0000

@Pavan.

Major Difference between Function and Procedure.

Function should return a value where as procedure might or might not.

You cannot run select statement on procedures where as you can run a select statement on (Table) functions.

You cannot perform many T-SQL operation inside a function where as you perform many more T-SQL Operations inside a procedure.

~Peace.

By: Pavan

Pavan — Wed, 21 Jul 2010 11:51:22 +0000

Hi,

what are the major difference between functions and Procedures?

By: vivek

vivek — Thu, 15 Jul 2010 18:11:44 +0000

How do i find number of sundays in given month?

By: Anand

Anand — Wed, 02 Jun 2010 17:25:44 +0000

I want to subscribe

By: Sarika

Sarika — Thu, 11 Mar 2010 12:27:38 +0000

We can write this also instead of case when if someone feels difficulty in using case statements then it will be easy for them using this…………………..
create function dbo.retdates(@date datetime)
returns int
as
begin
declare @out int
if month (@date) in(1,3,5,7,8,10,12)
set @out=31
else if month(@date) in(4,6,9,11)
set @out=30
else if ((year(@date)%4=0) and (year(@date)%100!=0)) or (year(@date)%400=0)
set @out=29
else
set @out=28
return @out
end
go

By: Mrityunjay Ravi

Mrityunjay Ravi — Fri, 26 Feb 2010 09:17:18 +0000

Hi expert,

You are excelent to write this function.

Thank you very much………………..

By: Madhivanan

Madhivanan — Fri, 05 Feb 2010 14:26:51 +0000

There are many ways

Here is one

declare @month int, @year int
select @month=2, @year=2009

select day(dateadd(day,-1,cast(@year*10000+(@month+1)*100+1 as char(8))))

Madhivanan

By: chethan

chethan — Sat, 16 Jan 2010 07:20:28 +0000

Very Informative site….

By: Gourav

Gourav — Fri, 24 Apr 2009 05:32:26 +0000

thanks bro… you hav done it….thank you very very much…
Regards
Gourav

By: Brian Tkatch

Brian Tkatch — Thu, 23 Apr 2009 16:31:30 +0000

@gourav, here’s a quick shot:
CREATE FUNCTION UDFDays(@mm tinyint,@yy smallint,@dyw varchar(9))
RETURNS TABLE
AS
RETURN
WITH
Data(The_Date)
AS
(
SELECT CONVERT(smalldatetime, CAST(@mm as varchar(2)) + ‘/01/’ + CAST(@YY as varchar(4)) , 101)
),
Days_In_Month
AS
(
SELECT The_Date, DATEADD(d, -1, DATEADD(m, 1, The_Date)) Next_Month FROM Data
UNION ALL
SELECT DATEADD(d, 1, The_Date), Next_Month FROM Days_In_Month WHERE The_Date < Next_Month
)
SELECT
DATEPART(d, The_Date) Day_Number
FROM
Days_In_Month
WHERE
DATENAME(dw, The_Date) = @dyw;
GO

By: Gourav

Gourav — Thu, 23 Apr 2009 15:25:29 +0000

Re post:… slight mistake frm my side…

hi.. experts… i need a similar UDF…
my req is…. if i give 3 param’s to the UDF.. like..
“month,year and dayofweek” then i should get a list of that day fom the given month,year

ex. for April 2009 Sunday
UDFDays(@mm,@yy,@dyw)
i.e UDFDays(04,2009,’Sunday’)
then i should get list as..

5
12
19
26
i.e… the dates from the month given for weekday.. like for Apil 2009 Saturday..
i expect..esult as

4
11
18
25

etc…
thanks in advance…

By: Gourav

Gourav — Thu, 23 Apr 2009 14:38:02 +0000

hi.. experts… i need a similar UDF…
my req is…. if i give 3 param’s to the UDF.. like..
“month,year and dayofweek” then i should get a list of that day fom the given month,year

ex. for April 2009 Sunday
UDFDays(@mm,@yy,@dyw)
i.e UDFDays(04,2009,’Sunday’)
then i should get list as..

6
13
20
27

i.e… the dates from the month given for weekday.. like for Apil 2009 Saturday..
i expect..esult as

5
12
19
26

etc…
thanks in advance…

By: SQL SERVER - 2008 - Interview Questions and Answers - Part 2 Journey to SQL Authority with Pinal Dave

Thu, 26 Feb 2009 11:55:56 +0000

[...] A Multi-Statement Table-Value user-defined function returns a table and is also an exceptional alternative to a view as the function can support multiple T-SQL statements to build the final result where the view is limited to a single SELECT statement. Also, the ability to pass parameters into a TSQL select command or a group of them gives us the capability to in essence create a parameterized, non-updateable view of the data in the underlying tables. Within the create function command you must define the table structure that is being returned. After creating this type of user-defined function, It can be used in the FROM clause of a T-SQL command unlike the behavior found when using a stored procedure which can also return record sets. (Read Here For Example) [...]

By: SQLAuthority News - Best Articles on SQLAuthority.com Journey to SQL Authority with Pinal Dave

Tue, 24 Feb 2009 12:10:47 +0000

[...] SQL SERVER – UDF – User Defined Function – Get Number of Days in Month [...]

By: Maheswaran

Maheswaran — Wed, 28 Jan 2009 10:23:32 +0000

I want No.of days in a Month – Here i will give Month(2) and Year(2009),

so, there are two parameters.

Pls Give me the function

By: Mahesh K Rajan

Mahesh K Rajan — Mon, 13 Oct 2008 08:39:18 +0000

We have already some built in functions avail, then why should we go behind all those steps…
Anyway, good logic…
-Mahesh

By: poleswar

poleswar — Mon, 21 Jul 2008 12:23:03 +0000

EXCELLENT …:))

EXACTLY SUITS MY REQUIREMENT

SUPERB

THNX A LOT………

By: Vishwanath

Vishwanath — Mon, 10 Mar 2008 09:51:58 +0000

Just a modification to Doug’s posting :

CREATE FUNCTION [dbo].[ufn_GetDaysInMonth] (@CurrentDate DATETIME )
RETURNS INT
AS
BEGIN
DECLARE @RetDate INT
SET @RetDate = DAY(DATEADD(d, -DAY(DATEADD(m,1,@CurrentDate)),DATEADD(m,1,@CurrentDate)))
RETURN @RetDate
END

– SELECT [dbo].[ufn_GetDaysInMonth] (’2008/02/25′)

By: Thiru

Thiru — Fri, 12 Oct 2007 03:04:26 +0000

Hi pinaldave,

Thank you very much

By: Doug

Doug — Thu, 20 Sep 2007 15:37:28 +0000

Try this one-liner:
CREATE FUNCTION [dbo].[ufn_GetDaysInMonth](
@CurrentDate DATETIME )
RETURNS INT
AS
BEGIN
RETURN DAY(DATEADD(d, -DAY(DATEADD(m,1,@dt)),DATEADD(m,1,@dt)))
END

By: Munna Sarfraz Ahmad

Munna Sarfraz Ahmad — Mon, 17 Sep 2007 10:49:16 +0000

Hi This User defined function will return the no. of days in a month

CREATE FUNCTION [dbo].[ufn_GetDaysInMonth](
@CurrentDate DATETIME )
RETURNS INT
AS
BEGIN
DECLARE @ReturnDays INT
SET @ReturnDays =
CASE WHEN MONTH(@CurrentDate) IN (1, 3, 5, 7, 8, 10, 12) THEN 31
WHEN MONTH(@CurrentDate) IN (4, 6, 9, 11) THEN 30
ELSE
CASE WHEN (YEAR(@CurrentDate) % 4 = 0 AND YEAR(@CurrentDate) % 100 != 0) OR (YEAR(@CurrentDate) % 400 = 0) THEN 29
ELSE 28
END
END
RETURN @ReturnDays
END

–SELECT dbo.ufn_GetDaysInMonth(GETDATE()) No_Of_Days_In_Month
GO