Appending Date in SQL Function

Appending Date in SQL Function - sql-server

I am trying to get the correct year based on the current date and append to the fiscal year months date part but I am getting an error that it is not an integer. Ideas or thoughts?
`ALTER FUNCTION [dbo].[fn_CS_IssuedMODs] (#currentDate DATE)
RETURNS TABLE
AS
RETURN
(SELECT cs.Specialist, CASE WHEN COUNT(mn.mod_number_id) IS NULL
THEN 0 ELSE COUNT(mn.mod_number_id) END AS IssuedMODS,
cs.user_certificateSerialNumber
FROM dbo.tbl_modificationNumbers AS mn RIGHT OUTER JOIN
dbo.vw_ContractSpecialists AS cs ON mn.mod_specialist_id = cs.user_certificateSerialNumber
WHERE (mn.statusID = 10) AND effective_date between '10/1/'+DATEPART(YEAR,#currentDate)
+ CASE WHEN DATEPART(MONTH, #CurrentDate) >= 10 THEN -1 ELSE 0 END AND '09/30/'+DATEPART (YEAR,#currentDate)
GROUP BY cs.Specialist, cs.user_certificateSerialNumber`

lets create some variables for testing:
DECLARE #currentDate DATETIME = '4/2/2014'
DECLARE #FiscalYearStart DATETIME
DECLARE #FiscalYearEnd DATETIME
Now we are going to check whether the current date is before or after October 1 and if so, we are going to start the fiscal year using the previous year, otherwise we are in the new fiscal year.
SELECT #FiscalYearStart =
(
CASE
WHEN DATEPART(MONTH, #currentDate) < 10 THEN
DATEADD(MONTH,9, DATEADD(YEAR, DATEDIFF(YEAR, 0, #currentDate) - 1, 0))
ELSE
DATEADD(MONTH,9, DATEADD(YEAR, DATEDIFF(YEAR, 0, #currentDate), 0))
END
),
#FiscalYearEnd =
(
CASE
WHEN DATEPART(MONTH, #currentDate) < 10 THEN
DATEADD(MONTH,9, DATEADD(YEAR, DATEDIFF(YEAR, 0, #currentDate), 0))
ELSE
DATEADD(MONTH,9, DATEADD(YEAR, DATEDIFF(YEAR, 0, #currentDate) + 1, 0))
END
)
SELECT #FiscalYearStart As FiscalYearStart, #FiscalYearEnd As FiscalYearEnd
Output:
FiscalYearStart FiscalYearEnd
2013-10-01 00:00:00.000 2014-10-01 00:00:00.000
Now you can use effective_date >= #FiscalYearStart AND effective_date < #FiscalYearEnd in your query to pull the correct data for the year.

Instead of datepart() use either datename(). Or, do an explicit cast() to a string.
The + operator is overloaded in SQL Server. When it encounters a number, it is treated as addition -- and you can't add strings.
I can't figure out what your code is supposed to be doing. There are probably better ways to accomplish what you want. For starters, you should use ISO standard date formats (YYYYMMDD or YYYY-MM-DD) for constants.

Try this:
ALTER FUNCTION [dbo].[fn_CS_IssuedMODs] (#currentDate DATE)
RETURNS TABLE
AS
RETURN
(SELECT cs.Specialist, CASE WHEN COUNT(mn.mod_number_id) IS NULL
THEN 0 ELSE COUNT(mn.mod_number_id) END AS IssuedMODS,
cs.user_certificateSerialNumber
FROM dbo.tbl_modificationNumbers AS mn RIGHT OUTER JOIN
dbo.vw_ContractSpecialists AS cs ON mn.mod_specialist_id = cs.user_certificateSerialNumber
WHERE (mn.statusID = 10) AND effective_date between Cast(DATEPART(YEAR, DateAdd(Year, CASE WHEN DATEPART(MONTH, #CurrentDate) >= 10 THEN -1 ELSE 0 END, #currentDate)) as varchar) + '-10-1'
AND Cast(DATEPART(YEAR,#currentDate) as varchar) + '-09-30'
GROUP BY cs.Specialist, cs.user_certificateSerialNumber

Related

Not getting any rows from query but there are rows available in the table

AND (
(datediff(DAY,getdate(), '2020-07-14 00:00:00.000') = 5)
OR (
datediff(DAY,getdate(), A.HX_RELIEVING_DT) BETWEEN 0 AND 4
AND '2020-04-17 20:36:53.000' >= GETDATE()-1
)
)
This is the output I want for relieving date and last updated time but I am unable to get this
EMPLID LOCATION SUPERVISOR_ID HX_RELIEVING_DT LASTUPDDTTM
-- SINGAPORE --- 2020-07-14 00:00:00.000 2020-04-17 20:36:53.000

I believe you tried to write if #MyDate is past:
AND ((DATEDIFF(DAY, #MyDate, GETDATE()) = 5) OR (DATEDIFF( DAY, A.HX_RELIEVING_DT, GETDATE()) BETWEEN 0 AND 4 AND DATEADD(DAY, -1, GETDATE()) <= #MyDate))
If #MyDate is future:
AND ((DATEDIFF(DAY, GETDATE(), #MyDate) = 5) OR (DATEDIFF(DAY, GETDATE(), A.HX_RELIEVING_DT) BETWEEN 0 AND 4 AND DATEADD(DAY, 1, GETDATE()) <= #MyDate))

Last condition from your WHERE clause is basically filtering your record from the output.
AND '2020-04-17 20:36:53.000' >= GETDATE()-1
A date from month "April" can not be bigger than a date value from July, right? You can check the values you are using in different condition in WHERE clause with this below query. You will get your issue automatically.
SELECT *,
datediff(DAY,getdate(), '2020-07-14 00:00:00.000'),
datediff(DAY,getdate(), A.HX_RELIEVING_DT),
GETDATE()-1
FROM your_table A

Find age between 15 to 25 years from a given column of date of birth? [duplicate]

I have a table listing people along with their date of birth (currently a nvarchar(25))
How can I convert that to a date, and then calculate their age in years?
My data looks as follows
ID Name DOB
1 John 1992-01-09 00:00:00
2 Sally 1959-05-20 00:00:00
I would like to see:
ID Name AGE DOB
1 John 17 1992-01-09 00:00:00
2 Sally 50 1959-05-20 00:00:00

There are issues with leap year/days and the following method, see the update below:
try this:
DECLARE #dob datetime
SET #dob='1992-01-09 00:00:00'
SELECT DATEDIFF(hour,#dob,GETDATE())/8766.0 AS AgeYearsDecimal
,CONVERT(int,ROUND(DATEDIFF(hour,#dob,GETDATE())/8766.0,0)) AS AgeYearsIntRound
,DATEDIFF(hour,#dob,GETDATE())/8766 AS AgeYearsIntTrunc
OUTPUT:
AgeYearsDecimal AgeYearsIntRound AgeYearsIntTrunc
--------------------------------------- ---------------- ----------------
17.767054 18 17
(1 row(s) affected)
UPDATE here are some more accurate methods:
BEST METHOD FOR YEARS IN INT
DECLARE #Now datetime, #Dob datetime
SELECT #Now='1990-05-05', #Dob='1980-05-05' --results in 10
--SELECT #Now='1990-05-04', #Dob='1980-05-05' --results in 9
--SELECT #Now='1989-05-06', #Dob='1980-05-05' --results in 9
--SELECT #Now='1990-05-06', #Dob='1980-05-05' --results in 10
--SELECT #Now='1990-12-06', #Dob='1980-05-05' --results in 10
--SELECT #Now='1991-05-04', #Dob='1980-05-05' --results in 10
SELECT
(CONVERT(int,CONVERT(char(8),#Now,112))-CONVERT(char(8),#Dob,112))/10000 AS AgeIntYears
you can change the above 10000 to 10000.0 and get decimals, but it will not be as accurate as the method below.
BEST METHOD FOR YEARS IN DECIMAL
DECLARE #Now datetime, #Dob datetime
SELECT #Now='1990-05-05', #Dob='1980-05-05' --results in 10.000000000000
--SELECT #Now='1990-05-04', #Dob='1980-05-05' --results in 9.997260273973
--SELECT #Now='1989-05-06', #Dob='1980-05-05' --results in 9.002739726027
--SELECT #Now='1990-05-06', #Dob='1980-05-05' --results in 10.002739726027
--SELECT #Now='1990-12-06', #Dob='1980-05-05' --results in 10.589041095890
--SELECT #Now='1991-05-04', #Dob='1980-05-05' --results in 10.997260273973
SELECT 1.0* DateDiff(yy,#Dob,#Now)
+CASE
WHEN #Now >= DATEFROMPARTS(DATEPART(yyyy,#Now),DATEPART(m,#Dob),DATEPART(d,#Dob)) THEN --birthday has happened for the #now year, so add some portion onto the year difference
( 1.0 --force automatic conversions from int to decimal
* DATEDIFF(day,DATEFROMPARTS(DATEPART(yyyy,#Now),DATEPART(m,#Dob),DATEPART(d,#Dob)),#Now) --number of days difference between the #Now year birthday and the #Now day
/ DATEDIFF(day,DATEFROMPARTS(DATEPART(yyyy,#Now),1,1),DATEFROMPARTS(DATEPART(yyyy,#Now)+1,1,1)) --number of days in the #Now year
)
ELSE --birthday has not been reached for the last year, so remove some portion of the year difference
-1 --remove this fractional difference onto the age
* ( -1.0 --force automatic conversions from int to decimal
* DATEDIFF(day,DATEFROMPARTS(DATEPART(yyyy,#Now),DATEPART(m,#Dob),DATEPART(d,#Dob)),#Now) --number of days difference between the #Now year birthday and the #Now day
/ DATEDIFF(day,DATEFROMPARTS(DATEPART(yyyy,#Now),1,1),DATEFROMPARTS(DATEPART(yyyy,#Now)+1,1,1)) --number of days in the #Now year
)
END AS AgeYearsDecimal

Gotta throw this one out there. If you convert the date using the 112 style (yyyymmdd) to a number you can use a calculation like this...
(yyyyMMdd - yyyyMMdd) / 10000 = difference in full years
declare #as_of datetime, #bday datetime;
select #as_of = '2009/10/15', #bday = '1980/4/20'
select
Convert(Char(8),#as_of,112),
Convert(Char(8),#bday,112),
0 + Convert(Char(8),#as_of,112) - Convert(Char(8),#bday,112),
(0 + Convert(Char(8),#as_of,112) - Convert(Char(8),#bday,112)) / 10000
output
20091015 19800420 290595 29

I have used this query in our production code for nearly 10 years:
SELECT FLOOR((CAST (GetDate() AS INTEGER) - CAST(Date_of_birth AS INTEGER)) / 365.25) AS Age

You need to consider the way the datediff command rounds.
SELECT CASE WHEN dateadd(year, datediff (year, DOB, getdate()), DOB) > getdate()
THEN datediff(year, DOB, getdate()) - 1
ELSE datediff(year, DOB, getdate())
END as Age
FROM <table>
Which I adapted from here.
Note that it will consider 28th February as the birthday of a leapling for non-leap years e.g. a person born on 29 Feb 2020 will be considered 1 year old on 28 Feb 2021 instead of 01 Mar 2021.

So many of the above solutions are wrong DateDiff(yy,#Dob, #PassedDate) will not consider the month and day of both dates. Also taking the dart parts and comparing only works if they're properly ordered.
THE FOLLOWING CODE WORKS AND IS VERY SIMPLE:
create function [dbo].[AgeAtDate](
#DOB datetime,
#PassedDate datetime
)
returns int
with SCHEMABINDING
as
begin
declare #iMonthDayDob int
declare #iMonthDayPassedDate int
select #iMonthDayDob = CAST(datepart (mm,#DOB) * 100 + datepart (dd,#DOB) AS int)
select #iMonthDayPassedDate = CAST(datepart (mm,#PassedDate) * 100 + datepart (dd,#PassedDate) AS int)
return DateDiff(yy,#DOB, #PassedDate)
- CASE WHEN #iMonthDayDob <= #iMonthDayPassedDate
THEN 0
ELSE 1
END
End

EDIT: THIS ANSWER IS INCORRECT. I leave it in here as a warning to anyone tempted to use dayofyear, with a further edit at the end.
If, like me, you do not want to divide by fractional days or risk rounding/leap year errors, I applaud #Bacon Bits comment in a post above https://stackoverflow.com/a/1572257/489865 where he says:
If we're talking about human ages, you should calculate it the way
humans calculate age. It has nothing to do with how fast the earth
moves and everything to do with the calendar. Every time the same
month and day elapses as the date of birth, you increment age by 1.
This means the following is the most accurate because it mirrors what
humans mean when they say "age".
He then offers:
DATEDIFF(yy, #date, GETDATE()) -
CASE WHEN (MONTH(#date) > MONTH(GETDATE())) OR (MONTH(#date) = MONTH(GETDATE()) AND DAY(#date) > DAY(GETDATE()))
THEN 1 ELSE 0 END
There are several suggestions here involving comparing the month & day (and some get it wrong, failing to allow for the OR as correctly here!). But nobody has offered dayofyear, which seems so simple and much shorter. I offer:
DATEDIFF(year, #date, GETDATE()) -
CASE WHEN DATEPART(dayofyear, #date) > DATEPART(dayofyear, GETDATE()) THEN 1 ELSE 0 END
[Note: Nowhere in SQL BOL/MSDN is what DATEPART(dayofyear, ...) returns actually documented! I understand it to be a number in the range 1--366; most importantly, it does not change by locale as per DATEPART(weekday, ...) & SET DATEFIRST.]
EDIT: Why dayofyear goes wrong: As user #AeroX has commented, if the birth/start date is after February in a non leap year, the age is incremented one day early when the current/end date is a leap year, e.g. '2015-05-26', '2016-05-25' gives an age of 1 when it should still be 0. Comparing the dayofyear in different years is clearly dangerous. So using MONTH() and DAY() is necessary after all.

I believe this is similar to other ones posted here.... but this solution worked for the leap year examples 02/29/1976 to 03/01/2011 and also worked for the case for the first year.. like 07/04/2011 to 07/03/2012 which the last one posted about leap year solution did not work for that first year use case.
SELECT FLOOR(DATEDIFF(DAY, #date1 , #date2) / 365.25)
Found here.

Since there isn't one simple answer that always gives the correct age, here's what I came up with.
SELECT DATEDIFF(YY, DateOfBirth, GETDATE()) -
CASE WHEN RIGHT(CONVERT(VARCHAR(6), GETDATE(), 12), 4) >=
RIGHT(CONVERT(VARCHAR(6), DateOfBirth, 12), 4)
THEN 0 ELSE 1 END AS AGE
This gets the year difference between the birth date and the current date. Then it subtracts a year if the birthdate hasn't passed yet.
Accurate all the time - regardless of leap years or how close to the birthdate.
Best of all - no function.

I've done a lot of thinking and searching about this and I have 3 solutions that
calculate age correctly
are short (mostly)
are (mostly) very understandable.
Here are testing values:
DECLARE #NOW DATETIME = '2013-07-04 23:59:59'
DECLARE #DOB DATETIME = '1986-07-05'
Solution 1: I found this approach in one js library. It's my favourite.
DATEDIFF(YY, #DOB, #NOW) -
CASE WHEN DATEADD(YY, DATEDIFF(YY, #DOB, #NOW), #DOB) > #NOW THEN 1 ELSE 0 END
It's actually adding difference in years to DOB and if it is bigger than current date then subtracts one year. Simple right? The only thing is that difference in years is duplicated here.
But if you don't need to use it inline you can write it like this:
DECLARE #AGE INT = DATEDIFF(YY, #DOB, #NOW)
IF DATEADD(YY, #AGE, #DOB) > #NOW
SET #AGE = #AGE - 1
Solution 2: This one I originally copied from #bacon-bits. It's the easiest to understand but a bit long.
DATEDIFF(YY, #DOB, #NOW) -
CASE WHEN MONTH(#DOB) > MONTH(#NOW)
OR MONTH(#DOB) = MONTH(#NOW) AND DAY(#DOB) > DAY(#NOW)
THEN 1 ELSE 0 END
It's basically calculating age as we humans do.
Solution 3: My friend refactored it into this:
DATEDIFF(YY, #DOB, #NOW) -
CEILING(0.5 * SIGN((MONTH(#DOB) - MONTH(#NOW)) * 50 + DAY(#DOB) - DAY(#NOW)))
This one is the shortest but it's most difficult to understand. 50 is just a weight so the day difference is only important when months are the same. SIGN function is for transforming whatever value it gets to -1, 0 or 1. CEILING(0.5 * is the same as Math.max(0, value) but there is no such thing in SQL.

What about:
DECLARE #DOB datetime
SET #DOB='19851125'
SELECT Datepart(yy,convert(date,GETDATE())-#DOB)-1900
Wouldn't that avoid all those rounding, truncating and ofsetting issues?

Just check whether the below answer is feasible.
DECLARE #BirthDate DATE = '09/06/1979'
SELECT
(
YEAR(GETDATE()) - YEAR(#BirthDate) -
CASE WHEN (MONTH(GETDATE()) * 100) + DATEPART(dd, GETDATE()) >
(MONTH(#BirthDate) * 100) + DATEPART(dd, #BirthDate)
THEN 1
ELSE 0
END
)

select floor((datediff(day,0,#today) - datediff(day,0,#birthdate)) / 365.2425) as age
There are a lot of 365.25 answers here. Remember how leap years are defined:
Every four years
except every 100 years
except every 400 years

There are many answers to this question, but I think this one is close to the truth.
The datediff(year,…,…) function, as we all know, only counts the boundaries crossed by the date part, in this case the year. As a result it ignores the rest of the year.
This will only give the age in completed years if the year were to start on the birthday. It probably doesn’t, but we can fake it by adjusting the asking date back by the same amount.
In pseudopseudo code, it’s something like this:
adjusted_today = today - month(dob) + 1 - day(dob) + 1
age = year(adjusted_today - dob)
The + 1 is to allow for the fact that the month and day numbers start from 1 and not 0.
The reason we subtract the month and the day separately rather than the day of the year is because February has the annoying tendency to change its length.
The calculation in SQL is:
datediff(year,dob,dateadd(month,-month(dob)+1,dateadd(day,-day(dob)+1,today)))
where dob and today are presumed to be the date of birth and the asking date.
You can test this as follows:
WITH dates AS (
SELECT
cast('2022-03-01' as date) AS today,
cast('1943-02-25' as date) AS dob
)
select
datediff(year,dob,dateadd(month,-month(dob)+1,dateadd(day,-day(dob)+1,today))) AS age
from dates;
which gives you George Harrison’s age in completed years.
This is much cleaner than fiddling about with quarter days which will generally give you misleading values on the edges.
If you have the luxury of creating a scalar function, you can use something like this:
DROP FUNCTION IF EXISTS age;
GO
CREATE FUNCTION age(#dob date, #today date) RETURNS INT AS
BEGIN
SET #today = dateadd(month,-month(#dob)+1,#today);
SET #today = dateadd(day,-day(#dob)+1,#today);
RETURN datediff(year,#dob,#today);
END;
GO
Remember, you need to call dbo.age() because, well, Microsoft.

DECLARE #DOB datetime
set #DOB ='11/25/1985'
select floor(
( cast(convert(varchar(8),getdate(),112) as int)-
cast(convert(varchar(8),#DOB,112) as int) ) / 10000
)
source: http://beginsql.wordpress.com/2012/04/26/how-to-calculate-age-in-sql-server/

Try This
DECLARE #date datetime, #tmpdate datetime, #years int, #months int, #days int
SELECT #date = '08/16/84'
SELECT #tmpdate = #date
SELECT #years = DATEDIFF(yy, #tmpdate, GETDATE()) - CASE WHEN (MONTH(#date) > MONTH(GETDATE())) OR (MONTH(#date) = MONTH(GETDATE()) AND DAY(#date) > DAY(GETDATE())) THEN 1 ELSE 0 END
SELECT #tmpdate = DATEADD(yy, #years, #tmpdate)
SELECT #months = DATEDIFF(m, #tmpdate, GETDATE()) - CASE WHEN DAY(#date) > DAY(GETDATE()) THEN 1 ELSE 0 END
SELECT #tmpdate = DATEADD(m, #months, #tmpdate)
SELECT #days = DATEDIFF(d, #tmpdate, GETDATE())
SELECT Convert(Varchar(Max),#years)+' Years '+ Convert(Varchar(max),#months) + ' Months '+Convert(Varchar(Max), #days)+'days'

After trying MANY methods, this works 100% of the time using the modern MS SQL FORMAT function instead of convert to style 112. Either would work but this is the least code.
Can anyone find a date combination which does not work? I don't think there is one :)
--Set parameters, or choose from table.column instead:
DECLARE #DOB DATE = '2000/02/29' -- If #DOB is a leap day...
,#ToDate DATE = '2018/03/01' --...there birthday in this calculation will be
--0+ part tells SQL to calc the char(8) as numbers:
SELECT [Age] = (0+ FORMAT(#ToDate,'yyyyMMdd') - FORMAT(#DOB,'yyyyMMdd') ) /10000

CASE WHEN datepart(MM, getdate()) < datepart(MM, BIRTHDATE) THEN ((datepart(YYYY, getdate()) - datepart(YYYY, BIRTH_DATE)) -1 )
ELSE
CASE WHEN datepart(MM, getdate()) = datepart(MM, BIRTHDATE)
THEN
CASE WHEN datepart(DD, getdate()) < datepart(DD, BIRTHDATE) THEN ((datepart(YYYY, getdate()) - datepart(YYYY, BIRTHDATE)) -1 )
ELSE (datepart(YYYY, getdate()) - datepart(YYYY, BIRTHDATE))
END
ELSE (datepart(YYYY, getdate()) - datepart(YYYY, BIRTHDATE)) END
END

SELECT ID,
Name,
DATEDIFF(yy,CONVERT(DATETIME, DOB),GETDATE()) AS AGE,
DOB
FROM MyTable

How about this:
SET #Age = CAST(DATEDIFF(Year, #DOB, #Stamp) as int)
IF (CAST(DATEDIFF(DAY, DATEADD(Year, #Age, #DOB), #Stamp) as int) < 0)
SET #Age = #Age - 1

Try this solution:
declare #BirthDate datetime
declare #ToDate datetime
set #BirthDate = '1/3/1990'
set #ToDate = '1/2/2008'
select #BirthDate [Date of Birth], #ToDate [ToDate],(case when (DatePart(mm,#ToDate) < Datepart(mm,#BirthDate))
OR (DatePart(m,#ToDate) = Datepart(m,#BirthDate) AND DatePart(dd,#ToDate) < Datepart(dd,#BirthDate))
then (Datepart(yy, #ToDate) - Datepart(yy, #BirthDate) - 1)
else (Datepart(yy, #ToDate) - Datepart(yy, #BirthDate))end) Age

This will correctly handle the issues with the birthday and rounding:
DECLARE #dob datetime
SET #dob='1992-01-09 00:00:00'
SELECT DATEDIFF(YEAR, '0:0', getdate()-#dob)

Ed Harper's solution is the simplest I have found which never returns the wrong answer when the month and day of the two dates are 1 or less days apart. I made a slight modification to handle negative ages.
DECLARE #D1 AS DATETIME, #D2 AS DATETIME
SET #D2 = '2012-03-01 10:00:02'
SET #D1 = '2013-03-01 10:00:01'
SELECT
DATEDIFF(YEAR, #D1,#D2)
+
CASE
WHEN #D1<#D2 AND DATEADD(YEAR, DATEDIFF(YEAR,#D1, #D2), #D1) > #D2
THEN - 1
WHEN #D1>#D2 AND DATEADD(YEAR, DATEDIFF(YEAR,#D1, #D2), #D1) < #D2
THEN 1
ELSE 0
END AS AGE

The answer marked as correct is nearer to accuracy but, it fails in following scenario - where Year of birth is Leap year and day are after February month
declare #ReportStartDate datetime = CONVERT(datetime, '1/1/2014'),
#DateofBirth datetime = CONVERT(datetime, '2/29/1948')
FLOOR(DATEDIFF(HOUR,#DateofBirth,#ReportStartDate )/8766)
OR
FLOOR(DATEDIFF(HOUR,#DateofBirth,#ReportStartDate )/8765.82) -- Divisor is more accurate than 8766
-- Following solution is giving me more accurate results.
FLOOR(DATEDIFF(YEAR,#DateofBirth,#ReportStartDate) - (CASE WHEN DATEADD(YY,DATEDIFF(YEAR,#DateofBirth,#ReportStartDate),#DateofBirth) > #ReportStartDate THEN 1 ELSE 0 END ))
It worked in almost all scenarios, considering leap year, date as 29 feb, etc.
Please correct me if this formula have any loophole.

Declare #dob datetime
Declare #today datetime
Set #dob = '05/20/2000'
set #today = getdate()
select CASE
WHEN dateadd(year, datediff (year, #dob, #today), #dob) > #today
THEN datediff (year, #dob, #today) - 1
ELSE datediff (year, #dob, #today)
END as Age

Here is how i calculate age given a birth date and current date.
select case
when cast(getdate() as date) = cast(dateadd(year, (datediff(year, '1996-09-09', getdate())), '1996-09-09') as date)
then dateDiff(yyyy,'1996-09-09',dateadd(year, 0, getdate()))
else dateDiff(yyyy,'1996-09-09',dateadd(year, -1, getdate()))
end as MemberAge
go

CREATE function dbo.AgeAtDate(
#DOB datetime,
#CompareDate datetime
)
returns INT
as
begin
return CASE WHEN #DOB is null
THEN
null
ELSE
DateDiff(yy,#DOB, #CompareDate)
- CASE WHEN datepart(mm,#CompareDate) > datepart(mm,#DOB) OR (datepart(mm,#CompareDate) = datepart(mm,#DOB) AND datepart(dd,#CompareDate) >= datepart(dd,#DOB))
THEN 0
ELSE 1
END
END
End
GO

DECLARE #FromDate DATETIME = '1992-01-2623:59:59.000',
#ToDate DATETIME = '2016-08-10 00:00:00.000',
#Years INT, #Months INT, #Days INT, #tmpFromDate DATETIME
SET #Years = DATEDIFF(YEAR, #FromDate, #ToDate)
- (CASE WHEN DATEADD(YEAR, DATEDIFF(YEAR, #FromDate, #ToDate),
#FromDate) > #ToDate THEN 1 ELSE 0 END)
SET #tmpFromDate = DATEADD(YEAR, #Years , #FromDate)
SET #Months = DATEDIFF(MONTH, #tmpFromDate, #ToDate)
- (CASE WHEN DATEADD(MONTH,DATEDIFF(MONTH, #tmpFromDate, #ToDate),
#tmpFromDate) > #ToDate THEN 1 ELSE 0 END)
SET #tmpFromDate = DATEADD(MONTH, #Months , #tmpFromDate)
SET #Days = DATEDIFF(DAY, #tmpFromDate, #ToDate)
- (CASE WHEN DATEADD(DAY, DATEDIFF(DAY, #tmpFromDate, #ToDate),
#tmpFromDate) > #ToDate THEN 1 ELSE 0 END)
SELECT #FromDate FromDate, #ToDate ToDate,
#Years Years, #Months Months, #Days Days

What about a solution with only date functions, not math, not worries about leap year
CREATE FUNCTION dbo.getAge(#dt datetime)
RETURNS int
AS
BEGIN
RETURN
DATEDIFF(yy, #dt, getdate())
- CASE
WHEN
MONTH(#dt) > MONTH(GETDATE()) OR
(MONTH(#dt) = MONTH(GETDATE()) AND DAY(#dt) > DAY(GETDATE()))
THEN 1
ELSE 0
END
END

declare #birthday as datetime
set #birthday = '2000-01-01'
declare #today as datetime
set #today = GetDate()
select
case when ( substring(convert(varchar, #today, 112), 5,4) >= substring(convert(varchar, #birthday, 112), 5,4) ) then
(datepart(year,#today) - datepart(year,#birthday))
else
(datepart(year,#today) - datepart(year,#birthday)) - 1
end

The following script checks the difference in years between now and the given date of birth; the second part checks whether the birthday is already past in the current year; if not, it subtracts it:
SELECT year(NOW()) - year(date_of_birth) - (CONCAT(year(NOW()), '-', month(date_of_birth), '-', day(date_of_birth)) > NOW()) AS Age
FROM tableName;

Daily report with stored procedure

I have this sp to make a report which needs to be daily. How can I implement the day part? It is OK like I wrote or that is some easy way?!
ALTER PROCEDURE [dbo].[pr_Report]
#YearOfRegistration INT
AS
SELECT
peCountryID,
peCountryName as coName,
ISNULL(SUM(CASE WHEN peIsSubmittedFL = 1 THEN 1 ELSE 0 END ),0) AS rdValue1,
ISNULL(SUM(CASE WHEN peIsSubmittedFL = 0 THEN 1 ELSE 0 END ),0) AS rdValue2,
COUNT(*) AS Total
FROM
vPerson
WHERE
#YearOfRegistration = 0
OR peYearOfRegistration = #YearOfRegistration
AND (DATEPART(dd, peSubmitDate) = DATEPART(dd, GETDATE())
AND DATEPART(MM, peSubmitDate) = DATEPART(MM, GETDATE())
AND DATEPART(yy, peSubmitDate) = DATEPART(YY, GETDATE()))
GROUP BY
peCountryofResidencyID, peCountryOfResidencyName

The logic is correct, but it is a really bad way to do it. Wherever possible to you should avoid calling functions on your data, especially in the where clause, because it means that any indexes on the underlying columns can not be used.
Your predicate would be better written as:
WHERE peSubmitDate >= CAST(GETDATE() AS DATE)
AND peSubmitDate < DATEADD(DAY, 1, CAST(GETDATE() AS DATE));
This way indexes can be used, and your query is sargable
As it happens, converting DATETIME to DATE (and vice versa) is actually an exception to the rule of not using functions, so you can shorten this to:
WHERE CONVERT(DATE, peSubmitDate) = CONVERT(DATE, GETDATE())
Another point is that although it might look better to use OR to accommodate both your options (of filtering by year or returning all records), you will find that having two separate queries will perform better. so your final SP might be:
ALTER PROC [dbo].[pr_Report] #YearOfRegistration INT
AS
BEGIN
IF (#YearOfRegistration = 0)
BEGIN
SELECT peCountryID,
peCountryName as coName,
ISNULL(SUM(CASE WHEN peIsSubmittedFL = 1 THEN 1 ELSE 0 END ),0) AS rdValue1,
ISNULL(SUM(CASE WHEN peIsSubmittedFL = 0 THEN 1 ELSE 0 END ),0) AS rdValue2,
COUNT(*) AS Total
FROM vPerson
WHERE CONVERT(DATE, peSubmitDate) = CONVERT(DATE, GETDATE())
GROUP BY peCountryofResidencyID,peCountryOfResidencyName
END
ELSE
BEGIN
SELECT peCountryID,
peCountryName as coName,
ISNULL(SUM(CASE WHEN peIsSubmittedFL = 1 THEN 1 ELSE 0 END ),0) AS rdValue1,
ISNULL(SUM(CASE WHEN peIsSubmittedFL = 0 THEN 1 ELSE 0 END ),0) AS rdValue2,
COUNT(*) AS Total
FROM vPerson
WHERE CONVERT(DATE, peSubmitDate) = CONVERT(DATE, GETDATE())
AND peYearOfRegistration = #YearOfRegistration
GROUP BY peCountryofResidencyID,peCountryOfResidencyName;
END
END

getdate returns a datetime, so if you want to compare just the date and not the time of day, you could use cast. If peSubmitDate is of datatype Date , use this comparison:
peSubmitDate = cast(GetDate() as date)
If it is a datatime then use it like this:
cast(peSubmitDate as date) = cast(GetDate() as date)
The latter one gives worse performance, so only use this if is a datetime

Explicit conversion from data type date to int is not allowed

I am trying to calculate AGE of contracts, however I am getting the error
Explicit conversion from data type date to int is not allowed
This is my code:
SELECT
Contract_hist.*,
IB.*,
CAST((CASE
WHEN (CAST(CONVERT(INT, Setup.[Start]) - CONVERT(INT,[IB].[Install_Date])) AS INT))/365 <= 0
THEN 0
WHEN (CAST(CONVERT(INT, Setup.[Start]) - CONVERT(INT,[IB].[Install_Date])) AS INT)) / 365 > 0
THEN (CAST(CONVERT(INT, Setup.[Start]) CONVERT(INT,[IB].[Install_Date])) AS INT)) / 365
END) AS INT) AS AGE
FROM
Setup, Contract_hist
INNER JOIN
IB ON Contract_hist.[System No] = IB.System_ID
Where "Setup.[Start]" & "[IB].[Install_Date]" are datetime2 values.

You could convert those datetime2 fields first to datetime, then to an int.
(convert(int, convert(datetime, Setup.[Start])) - convert(int,convert(datetime, [IB].[Install_Date])))/365
But that can be shortened to:
cast(convert(datetime, Setup.[Start]) - convert(datetime, IB.[Install_Date]) as int)/365
Or you could simplify it even more and calculate the difference in years directly with datediff:
datediff(year, [IB].[Install_Date], Setup.[Start])
And that CASE can also be simplified:
case
when datediff(year, [IB].[Install_Date], Setup.[Start]) > 0
then datediff(year, [IB].[Install_Date], Setup.[Start])
else 0
end as AGE

Maybe this?
SELECT
Contract_hist.*
,IB.*
,CASE
WHEN DATEDIFF(year,[IB].[Install_Date], Setup.[Start] ) <= 0 THEN 0
ELSE DATEDIFF(year, [IB].[Install_Date], Setup.[Start])
END AS AGE
FROM Setup, Contract_hist
INNER JOIN IB ON Contract_hist.[System No] = IB.System_ID

Seems like casting to a float/int is not supported in the latter versions of sql server. Try using DATEDIFF(dd, '12/30/1899', mydatefield)

get all record of last month with respect to current month in sql server

i have to two tables payment_tbl and bill_tbl with following attributes
payment_tbl (payment_ID int -> pk)
bill_tbl (payment_ID int -> Fk
,bill_IssueDate date
,bill_status varchar
,bill_amount type int
)
so if i want to know which payment_ID has bill status 'Not Paid' in last month with respect to current month, let now month is Feb 2017 i want to know in jan 2017 who Did not paid Bill.
i tried following query but it return me empty column names
SELECT p.payment_ID
,b.amount_To_Pay
FROM bill_tbl AS b
INNER JOIN payment_tbl AS p
ON b.payment_id = p.payment_ID
WHERE b.bill_status = 'Not Paid'
AND b.bill_IssueDate >= DATEADD(mm, DATEDIFF(mm, 0, GETDATE()) - 1, 0)
AND b.bill_IssueDate < DATEADD(mm, DATEDIFF(mm, 0, GETDATE()) + 0, 0)

You need to look at the first of the current and previous months and set your range to that.
select
p.payment_ID,
b.amount_To_Pay
FROM
bill_tbl AS b
INNER JOIN payment_tbl AS p ON
b.payment_id = p.payment_ID
WHERE
(b.bill_status = 'Not Paid')
and b.bill_IssueDate < DATEADD(month, DATEDIFF(month, 0, getdate()), 0)
and b.bill_IssueDate >= DATEADD(month, DATEDIFF(month, 0, dateadd(month,-1,getdate())), 0)

SHOULD BE AS SIMPLE AS -
SELECT p.payment_ID
,b.amount_To_Pay
FROM bill_tbl AS b
INNER JOIN payment_tbl AS p
ON b.payment_id = p.payment_ID
WHERE b.bill_status = 'Not Paid'
AND DATEDIFF(month, b.bill_IssueDate ,getdate()) = 1
you have something else wrong, your date range is ok, get rid of some of the WHERE clauses and see if there actually is any data for those months - I don't think it is your date range

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