Vra

Wat sou die beste manier om iemand se ouderdom in jare, maande, en dae te bereken in T-SQL (SQL Server 2000)?

wees

Die datediff funksie nie hanteer jaar grense goed, plus kry die maande en dae afsonderlike sal 'n beer wees. Ek weet ek kan dit doen op die kliënt kant relatief maklik, maar ek wil graag het dit in my gestoor gedoen prosedure .

Was dit nuttig?

Oplossing

Hier is 'n paar T-SQL wat gee jou die aantal jare, maande, en dae sedert die dag wat in @date. Dit neem in ag die feit dat DATEDIFF () bere die verskil sonder inagneming van watter maand of dag is dit (so die maand verskil tussen 31/08 en 01/09 is 1 maand) en hanteer dit met 'n case-stelling dat die uitslag waar decrements toepaslik.

DECLARE @date datetime, @tmpdate datetime, @years int, @months int, @days int
SELECT @date = '2/29/04'

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 @years, @months, @days

Ander wenke

Probeer hierdie ...

SELECT CASE WHEN
 (DATEADD(year,DATEDIFF(year, @datestart  ,@dateend) , @datestart) > @dateend)
THEN DATEDIFF(year, @datestart  ,@dateend) -1
ELSE DATEDIFF(year, @datestart  ,@dateend)
END

Basies die "DateDiff (jaar ...", gee jou die ouderdom van die persoon sal vanjaar draai, so ek het net voeg 'n case-stelling om te sê, as hulle nie 'n verjaarsdag nog vanjaar gehad het, dan trek 1 jaar, anders terugkeer die waarde.

Eenvoudige manier om die ouderdom as teks te kry, is soos volg:

Select cast((DATEDIFF(m, date_of_birth, GETDATE())/12) as varchar) + ' Y & ' + 
       cast((DATEDIFF(m, date_of_birth, GETDATE())%12) as varchar) + ' M' as Age

Resultate formaat sal:

**63 Y & 2 M**

Geïmplementeer deur rekenkundige met ISO formaat datum.

declare @now date,@dob date, @now_i int,@dob_i int, @days_in_birth_month int
declare @years int, @months int, @days int
set @now = '2013-02-28' 
set @dob = '2012-02-29' -- Date of Birth

set @now_i = convert(varchar(8),@now,112) -- iso formatted: 20130228
set @dob_i = convert(varchar(8),@dob,112) -- iso formatted: 20120229
set @years = ( @now_i - @dob_i)/10000
-- (20130228 - 20120229)/10000 = 0 years

set @months =(1200 + (month(@now)- month(@dob))*100 + day(@now) - day(@dob))/100 %12
-- (1200 + 0228 - 0229)/100 % 12 = 11 months

set @days_in_birth_month = day(dateadd(d,-1,left(convert(varchar(8),dateadd(m,1,@dob),112),6)+'01'))
set @days = (sign(day(@now) - day(@dob))+1)/2 * (day(@now) - day(@dob))
          + (sign(day(@dob) - day(@now))+1)/2 * (@days_in_birth_month - day(@dob) + day(@now))
-- ( (-1+1)/2*(28 - 29) + (1+1)/2*(29 - 29 + 28))
-- Explain: if the days of now is bigger than the days of birth, then diff the two days
--          else add the days of now and the distance from the date of birth to the end of the birth month 
select @years,@months,@days -- 0, 11, 28 

toets gevalle

Die benadering van dae is anders as die aanvaarde antwoord, die bedrag wat in die kommentaar hieronder verskille:

       dob        now  years  months  days 
2012-02-29 2013-02-28      0      11    28  --Days will be 30 if calculated by the approach in accepted answer. 
2012-02-29 2016-02-28      3      11    28  --Days will be 31 if calculated by the approach in accepted answer, since the day of birth will be changed to 28 from 29 after dateadd by years. 
2012-02-29 2016-03-31      4       1     2
2012-01-30 2016-02-29      4       0    30
2012-01-30 2016-03-01      4       1     2  --Days will be 1 if calculated by the approach in accepted answer, since the day of birth will be changed to 30 from 29 after dateadd by years.
2011-12-30 2016-02-29      4       1    30

'n kort weergawe van Dae deur case-stelling:

set @days = CASE WHEN day(@now) >= day(@dob) THEN day(@now) - day(@dob)
                 ELSE @days_in_birth_month - day(@dob) + day(@now) END

As jy die ouderdom van jare en net maande wil, kan dit makliker wees

set @years = ( @now_i/100 - @dob_i/100)/100
set @months =(12 + month(@now) - month(@dob))%12 
select @years,@months -- 1, 0

Nota: 'n Baie nuttige skakel van SQL Server Datum Formats

Hier is 'n (effens) eenvoudiger weergawe:

CREATE PROCEDURE dbo.CalculateAge 
    @dayOfBirth datetime
AS

DECLARE @today datetime, @thisYearBirthDay datetime
DECLARE @years int, @months int, @days int

SELECT @today = GETDATE()

SELECT @thisYearBirthDay = DATEADD(year, DATEDIFF(year, @dayOfBirth, @today), @dayOfBirth)

SELECT @years = DATEDIFF(year, @dayOfBirth, @today) - (CASE WHEN @thisYearBirthDay > @today THEN 1 ELSE 0 END)

SELECT @months = MONTH(@today - @thisYearBirthDay) - 1

SELECT @days = DAY(@today - @thisYearBirthDay) - 1

SELECT @years, @months, @days
GO

Dieselfde soort ding as 'n funksie.

create function [dbo].[Age](@dayOfBirth datetime, @today datetime)
   RETURNS varchar(100)
AS

Begin
DECLARE @thisYearBirthDay datetime
DECLARE @years int, @months int, @days int

set @thisYearBirthDay = DATEADD(year, DATEDIFF(year, @dayOfBirth, @today), @dayOfBirth)
set @years = DATEDIFF(year, @dayOfBirth, @today) - (CASE WHEN @thisYearBirthDay > @today THEN 1 ELSE 0 END)
set @months = MONTH(@today - @thisYearBirthDay) - 1
set @days = DAY(@today - @thisYearBirthDay) - 1

return cast(@years as varchar(2)) + ' years,' + cast(@months as varchar(2)) + ' months,' + cast(@days as varchar(3)) + ' days'
end
create  procedure getDatedifference

(
    @startdate datetime,
    @enddate datetime
)
as
begin
    declare @monthToShow int
    declare @dayToShow int

    --set @startdate='01/21/1934'
    --set @enddate=getdate()

    if (DAY(@startdate) > DAY(@enddate))
        begin
            set @dayToShow=0

            if (month(@startdate) > month(@enddate))
                begin
                    set @monthToShow=  (12-month(@startdate)+ month(@enddate)-1)
                end
            else if (month(@startdate) < month(@enddate))
                begin
                    set @monthToShow=  ((month(@enddate)-month(@startdate))-1)
                end
            else
               begin
                   set @monthToShow=  11
               end
            -- set @monthToShow= convert(int, DATEDIFF(mm,0,DATEADD(dd,DATEDIFF(dd,0,@enddate)- DATEDIFF(dd,0,@startdate),0)))-((convert(int,FLOOR(DATEDIFF(day, @startdate, @enddate) / 365.25))*12))-1
                         if(@monthToShow<0)
                         begin
                            set @monthToShow=0
                         end

                      declare @amonthbefore integer
                      set @amonthbefore=Month(@enddate)-1
                          if(@amonthbefore=0)
                             begin
                                set @amonthbefore=12
                              end


                      if (@amonthbefore  in(1,3,5,7,8,10,12))
                          begin
                            set @dayToShow=31-DAY(@startdate)+DAY(@enddate)
                          end
                      if (@amonthbefore=2)
                         begin
                           IF (YEAR( @enddate ) % 4 = 0 AND YEAR( @enddate ) % 100 != 0) OR  YEAR( @enddate ) % 400 = 0
                                 begin
                                    set @dayToShow=29-DAY(@startdate)+DAY(@enddate)
                                  end
                           else
                               begin
                                   set @dayToShow=28-DAY(@startdate)+DAY(@enddate)
                           end
                      end
                      if (@amonthbefore in (4,6,9,11))
                        begin
                           set @dayToShow=30-DAY(@startdate)+DAY(@enddate)
                        end
                 end
    else
        begin
          --set @monthToShow=convert(int, DATEDIFF(mm,0,DATEADD(dd,DATEDIFF(dd,0,@enddate)- DATEDIFF(dd,0,@startdate),0)))-((convert(int,FLOOR(DATEDIFF(day, @startdate, @enddate) / 365.25))*12))
          if (month(@enddate)< month(@startdate))
              begin
                 set @monthToShow=12+(month(@enddate)-month(@startdate))
              end
          else
              begin
                set @monthToShow= (month(@enddate)-month(@startdate))
              end
          set @dayToShow=DAY(@enddate)-DAY(@startdate)
        end

    SELECT
        FLOOR(DATEDIFF(day, @startdate, @enddate) / 365.25) as [yearToShow],
          @monthToShow as  monthToShow ,@dayToShow as dayToShow ,
        convert(varchar,FLOOR(DATEDIFF(day, @startdate, @enddate) / 365.25)) +' Year ' + convert(varchar,@monthToShow) +' months '+convert(varchar,@dayToShow)+' days ' as age

    return
end

Ek het die vraag 'n paar keer gesien met resultate uitdruk Jare, Maand, Dae, maar nooit 'n numeriese / desimale gevolg. (Ten minste nie een wat nie verkeerd doen ronde). Ek verwelkom terugvoer oor hierdie funksie. Kan nie nog 'n bietjie aanpassing nodig.

- Input om die funksie is twee datums. - Uitgawe is die numeriese aantal jare tussen die twee datums in Desimale (7,4) formaat. - Uitgawe is altyd altyd 'n possitive nommer.

- NOTA: Uitgawe nie hanteer as verskil is groter as 999,9999

- Logic is gebaseer op drie stappe. - 1) Is die verskil minder as 1 jaar (0,5000, 0,3333, 0,6667, ens). -. 2) Is die verskil presies 'n hele aantal jare (1,2,3, ens)

- 3) (Else) ... Die verskil is jare en 'n paar aantal dae. (1,5000, 2,3333, 7,6667, ens.)



CREATE Function [dbo].[F_Get_Actual_Age](@pi_date1 datetime,@pi_date2 datetime)
RETURNS Numeric(7,4)
AS
BEGIN

Declare 
 @l_tmp_date    DATETIME
,@l_days1       DECIMAL(9,6)
,@l_days2       DECIMAL(9,6)
,@l_result      DECIMAL(10,6)
,@l_years       DECIMAL(7,4)


  --Check to make sure there is a date for both inputs
  IF @pi_date1 IS NOT NULL and @pi_date2 IS NOT NULL  
  BEGIN

    IF @pi_date1 > @pi_date2 --Make sure the "older" date is in @pi_date1
      BEGIN
        SET @l_tmp_date = @pi_date2
        SET @pi_date2 = @Pi_date1
        SET @pi_date1 = @l_tmp_date
      END

    --Check #1 If date1 + 1 year is greater than date2, difference must be less than 1 year
    IF DATEADD(YYYY,1,@pi_date1) > @pi_date2  
      BEGIN
          --How many days between the two dates (numerator)
        SET @l_days1 = DATEDIFF(dd,@pi_date1, @pi_date2) 
          --subtract 1 year from date2 and calculate days bewteen it and date2
          --This is to get the denominator and accounts for leap year (365 or 366 days)
        SET @l_days2 = DATEDIFF(dd,dateadd(yyyy,-1,@pi_date2),@pi_date2) 
        SET @l_years = @l_days1 / @l_days2 -- Do the math
      END
    ELSE
      --Check #2  Are the dates an exact number of years apart.
      --Calculate years bewteen date1 and date2, then add the years to date1, compare dates to see if exactly the same.
      IF DATEADD(YYYY,DATEDIFF(YYYY,@pi_date1,@pi_date2),@pi_date1) = @pi_date2  
        SET @l_years = DATEDIFF(YYYY,@pi_date1, @pi_date2) --AS Years, 'Exactly even Years' AS Msg
      ELSE
      BEGIN
        --Check #3 The rest of the cases.
        --Check if datediff, returning years, over or under states the years difference
        SET @l_years = DATEDIFF(YYYY,@pi_date1, @pi_date2)
        IF DATEADD(YYYY,@l_years,@pi_date1) > @pi_date2
          SET @l_years = @l_years -1
          --use basicly same logic as in check #1  
        SET @l_days1 = DATEDIFF(dd,DATEADD(YYYY,@l_years,@pi_date1), @pi_date2) 
        SET @l_days2 = DATEDIFF(dd,dateadd(yyyy,-1,@pi_date2),@pi_date2) 
        SET @l_years = @l_years + @l_days1 / @l_days2
        --SELECT @l_years AS Years, 'Years Plus' AS Msg
      END
  END
  ELSE
    SET @l_years = 0  --If either date was null

RETURN @l_Years  --Return the result as decimal(7,4)
END  

`

Nogal Ou vraag, maar ek wil deel wat ek gedoen het om te bereken ouderdom

    Declare @BirthDate As DateTime
Set @BirthDate = '1994-11-02'

SELECT DATEDIFF(YEAR,@BirthDate,GETDATE()) - (CASE 
WHEN MONTH(@BirthDate)> MONTH(GETDATE()) THEN 1 
WHEN MONTH(@BirthDate)= MONTH(GETDATE()) AND DAY(@BirthDate) > DAY(GETDATE()) THEN 1 
Else 0 END)

Daar is 'n maklike manier, gebaseer op die uur tussen die twee dae, maar met die einddatum kapt.

SELECT CAST(DATEDIFF(hour,Birthdate,CAST(GETDATE() as Date))/8766.0 as INT) AS Age FROM <YourTable>

Hierdie een het bewys dat dit uiters akkurate en betroubaar te wees. As dit nie was vir die innerlike te werp op die GETDATE () kan dit die verjaarsdag flip 'n paar uur voor middernag, maar met die rolverdeling, dood op die ouderdom verander oor by presies middernag is dit.

Ek gebruik hierdie funksie Ek gemodifiseerde (die Dae deel) Van @Dane antwoord: https://stackoverflow.com/a/57720 / 2097023

CREATE FUNCTION dbo.EdadAMD
    (
        @FECHA DATETIME
    )
    RETURNS NVARCHAR(10)
    AS
    BEGIN
        DECLARE
            @tmpdate DATETIME
          , @years   INT
          , @months  INT
          , @days    INT
          , @EdadAMD NVARCHAR(10);

        SELECT @tmpdate = @FECHA;

        SELECT @years = DATEDIFF(yy, @tmpdate, GETDATE()) - CASE
                                          WHEN (MONTH(@FECHA) >    MONTH(GETDATE()))
                                             OR (
                                                MONTH(@FECHA) = MONTH(GETDATE())
                                          AND DAY(@FECHA) > DAY(GETDATE())
                                          ) THEN
                                                1
                                            ELSE
                                                0
                                    END;
    SELECT @tmpdate = DATEADD(yy, @years, @tmpdate);
    SELECT @months = DATEDIFF(m, @tmpdate, GETDATE()) - CASE
                              WHEN DAY(@FECHA) > DAY(GETDATE()) THEN
                                                            1
                                                        ELSE
                                                            0
                                                    END;
    SELECT @tmpdate = DATEADD(m, @months, @tmpdate);

    IF MONTH(@FECHA) = MONTH(GETDATE())
       AND DAY(@FECHA) > DAY(GETDATE())
          SELECT @days = 
            DAY(EOMONTH(GETDATE(), -1)) - (DAY(@FECHA) - DAY(GETDATE()));
    ELSE
        SELECT @days = DATEDIFF(d, @tmpdate, GETDATE());

    SELECT @EdadAMD = CONCAT(@years, 'a', @months, 'm', @days, 'd');

    RETURN @EdadAMD;

END; 
GO

Dit werk baie goed.

Is jy probeer om die totale dae / maande / jare van 'n era te bereken? het jy 'n begin datum? Of probeer jy dit dissekteer (ex: 24 jaar, 1 maand, 29 dae)?

As jy 'n begin datum wat jy met, datediff wil uitvoer werk die totale dae / maande / jare met die volgende opdragte:

Select DateDiff(d,'1984-07-12','2008-09-11')

Select DateDiff(m,'1984-07-12','2008-09-11')

Select DateDiff(yyyy,'1984-07-12','2008-09-11')

met die onderskeie uitgange word (8827/290/24).

Nou, as jy wou die disseksie metode te doen, jy wil hê om die aantal jare in dae aftrek (dae - 365 * jaar), en dan doen verdere wiskunde op daardie om die maande te kry, ens

Hier is SQL-kode wat gee jou die aantal jare, maande, en dae sedert die sysdate. Tik waarde vir input_birth_date hierdie formaat (dd_mon_yy). wel: insette dieselfde waarde (geboortedatum) vir die jaar, maande & dae soos 01-mar-85

select trunc((sysdate -to_date('&input_birth_date_dd_mon_yy'))/365) years,
trunc(mod(( sysdate -to_date('&input_birth_date_dd_mon_yy'))/365,1)*12) months,
trunc((mod((mod((sysdate -to_date('&input_birth_date_dd_mon_yy'))/365,1)*12),1)*30)+1) days 
 from dual

DateTime waardes in T-SQL gestoor as vlotte oor. Jy kan net trek die datums van mekaar en jy het nou 'n nuwe datum wat die panne tussen hulle.

declare @birthdate datetime
set @birthdate = '6/15/1974'

--age in years - short version
print year(getdate() - @birthdate) - year(0)

--age in years - visualization
declare @mindate datetime
declare @span datetime

set @mindate = 0
set @span = getdate() - @birthdate

print @mindate
print @birthdate
print getdate()
print @span
--substract minyear from spanyear to get age in years
print year(@span) - year(@mindate)
print month(@span)
print day(@span)
CREATE FUNCTION DBO.GET_AGE
(
@DATE AS DATETIME
)
RETURNS VARCHAR(MAX)
AS
BEGIN

DECLARE @YEAR  AS VARCHAR(50) = ''
DECLARE @MONTH AS VARCHAR(50) = ''
DECLARE @DAYS  AS VARCHAR(50) = ''
DECLARE @RESULT AS VARCHAR(MAX) = ''

SET @YEAR  = CONVERT(VARCHAR,(SELECT DATEDIFF(MONTH,CASE WHEN DAY(@DATE) > DAY(GETDATE()) THEN DATEADD(MONTH,1,@DATE) ELSE @DATE END,GETDATE()) / 12 ))
SET @MONTH = CONVERT(VARCHAR,(SELECT DATEDIFF(MONTH,CASE WHEN DAY(@DATE) > DAY(GETDATE()) THEN DATEADD(MONTH,1,@DATE) ELSE @DATE END,GETDATE()) % 12 ))
SET @DAYS = DATEDIFF(DD,DATEADD(MM,CONVERT(INT,CONVERT(INT,@YEAR)*12 + CONVERT(INT,@MONTH)),@DATE),GETDATE())

SET @RESULT = (RIGHT('00' + @YEAR, 2) + ' YEARS ' + RIGHT('00' + @MONTH, 2) + ' MONTHS ' + RIGHT('00' + @DAYS, 2) + ' DAYS')

RETURN @RESULT
END

SELECT DBO.GET_AGE('04/12/1986')
DECLARE @BirthDate datetime, @AgeInMonths int
SET @BirthDate = '10/5/1971'
SET @AgeInMonths                              -- Determine the age in "months old":
    = DATEDIFF(MONTH, @BirthDate, GETDATE())  -- .Get the difference in months
    - CASE WHEN DATEPART(DAY,GETDATE())       -- .If today was the 1st to 4th,
              < DATEPART(DAY,@BirthDate)      --   (or before the birth day of month)
           THEN 1 ELSE 0 END                  --   ... don't count the month.
SELECT @AgeInMonths / 12 as AgeYrs            -- Divide by 12 months to get the age in years
      ,@AgeInMonths % 12 as AgeXtraMonths     -- Get the remainder of dividing by 12 months = extra months
      ,DATEDIFF(DAY                           -- For the extra days, find the difference between, 
               ,DATEADD(MONTH, @AgeInMonths   -- 1. Last Monthly Birthday 
                             , @BirthDate)    --     (if birthdays were celebrated monthly)
               ,GETDATE()) as AgeXtraDays     -- 2. Today's date.

Vir diegene wat wil om 'n berekende kolom skep in 'n tabel om die ouderdom te slaan:

CASE WHEN DateOfBirth< DATEADD(YEAR, (DATEPART(YEAR, GETDATE()) - DATEPART(YEAR, DateOfBirth))*-1, GETDATE()) 
     THEN DATEPART(YEAR, GETDATE()) - DATEPART(YEAR, DateOfBirth)
     ELSE DATEPART(YEAR, GETDATE()) - DATEPART(YEAR, DateOfBirth) -1 END

Hier is hoe ek bereken die ouderdom kry 'n geboorte datum en die huidige datum.

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

Daar is 'n ander metode vir bereken ouderdom is

Sien tabel hieronder

    FirstName       LastName    DOB
    sai             krishnan    1991-11-04
    Harish          S A         1998-10-11

Vir die vind van ouderdom, kan jy bereken deur maand

  Select datediff(MONTH,DOB,getdate())/12 as dates from [Organization].[Employee]

Die resultaat sal wees

firstname   dates
sai         27
Harish      20
declare @StartDate datetime = '2016-01-31'
declare @EndDate datetime = '2016-02-01'
SELECT @StartDate AS [StartDate]
      ,@EndDate AS [EndDate]
      ,DATEDIFF(Year,@StartDate,@EndDate) - CASE WHEN DATEADD(Year,DATEDIFF(Year,@StartDate,@EndDate), @StartDate) > @EndDate THEN 1 ELSE 0 END AS [Years]
      ,DATEDIFF(Month,(DATEADD(Year,DATEDIFF(Year,@StartDate,@EndDate) - CASE WHEN DATEADD(Year,DATEDIFF(Year,@StartDate,@EndDate), @StartDate) > @EndDate THEN 1 ELSE 0 END,@StartDate)),@EndDate) - CASE WHEN DATEADD(Month, DATEDIFF(Month,DATEADD(Year,DATEDIFF(Year,@StartDate,@EndDate) - CASE WHEN DATEADD(Year,DATEDIFF(Year,@StartDate,@EndDate), @StartDate) > @EndDate THEN 1 ELSE 0 END,@StartDate),@EndDate) , @StartDate) > @EndDate THEN 1 ELSE 0 END AS [Months]
      ,DATEDIFF(Day, DATEADD(Month,DATEDIFF(Month, (DATEADD(Year,DATEDIFF(Year,@StartDate,@EndDate) - CASE WHEN DATEADD(Year,DATEDIFF(Year,@StartDate,@EndDate), @StartDate) > @EndDate THEN 1 ELSE 0 END,@StartDate)),@EndDate) - CASE WHEN DATEADD(Month, DATEDIFF(Month,DATEADD(Year,DATEDIFF(Year,@StartDate,@EndDate) - CASE WHEN DATEADD(Year,DATEDIFF(Year,@StartDate,@EndDate), @StartDate) > @EndDate THEN 1 ELSE 0 END,@StartDate),@EndDate) , @StartDate) > @EndDate THEN 1 ELSE 0 END  ,DATEADD(Year,DATEDIFF(Year,@StartDate,@EndDate) - CASE WHEN DATEADD(Year,DATEDIFF(Year,@StartDate,@EndDate), @StartDate) > @EndDate THEN 1 ELSE 0 END,@StartDate)) ,@EndDate) - CASE WHEN DATEADD(Day,DATEDIFF(Day, DATEADD(Month,DATEDIFF(Month, (DATEADD(Year,DATEDIFF(Year,@StartDate,@EndDate) - CASE WHEN DATEADD(Year,DATEDIFF(Year,@StartDate,@EndDate), @StartDate) > @EndDate THEN 1 ELSE 0 END,@StartDate)),@EndDate) - CASE WHEN DATEADD(Month, DATEDIFF(Month,DATEADD(Year,DATEDIFF(Year,@StartDate,@EndDate) - CASE WHEN DATEADD(Year,DATEDIFF(Year,@StartDate,@EndDate), @StartDate) > @EndDate THEN 1 ELSE 0 END,@StartDate),@EndDate) , @StartDate) > @EndDate THEN 1 ELSE 0 END  ,DATEADD(Year,DATEDIFF(Year,@StartDate,@EndDate) - CASE WHEN DATEADD(Year,DATEDIFF(Year,@StartDate,@EndDate), @StartDate) > @EndDate THEN 1 ELSE 0 END,@StartDate)) ,@EndDate),DATEADD(Month,DATEDIFF(Month, (DATEADD(Year,DATEDIFF(Year,@StartDate,@EndDate) - CASE WHEN DATEADD(Year,DATEDIFF(Year,@StartDate,@EndDate), @StartDate) > @EndDate THEN 1 ELSE 0 END,@StartDate)),@EndDate) - CASE WHEN DATEADD(Month, DATEDIFF(Month,DATEADD(Year,DATEDIFF(Year,@StartDate,@EndDate) - CASE WHEN DATEADD(Year,DATEDIFF(Year,@StartDate,@EndDate), @StartDate) > @EndDate THEN 1 ELSE 0 END,@StartDate),@EndDate) , @StartDate) > @EndDate THEN 1 ELSE 0 END  ,DATEADD(Year,DATEDIFF(Year,@StartDate,@EndDate) - CASE WHEN DATEADD(Year,DATEDIFF(Year,@StartDate,@EndDate), @StartDate) > @EndDate THEN 1 ELSE 0 END,@StartDate))) > @EndDate THEN 1 ELSE 0 END AS [Days]
select DOB as Birthdate,
       YEAR(GETDATE()) as ThisYear, 
       YEAR(getdate()) - EAR(date1) as Age   
from TableName
SELECT DOB AS Birthdate ,
       YEAR(GETDATE()) AS ThisYear,
       YEAR(getdate()) - YEAR(DOB) AS Age
FROM tableprincejain
DECLARE @DoB AS DATE = '1968-10-24'
DECLARE @cDate AS DATE = CAST('2000-10-23' AS DATE)

SELECT 
--Get Year difference
DATEDIFF(YEAR,@DoB,@cDate) -
--Cases where year difference will be augmented
CASE 
    --If Date of Birth greater than date passed return 0
    WHEN YEAR(@DoB) - YEAR(@cDate) >= 0 THEN DATEDIFF(YEAR,@DoB,@cDate)

    --If date of birth month less than date passed subtract one year
    WHEN MONTH(@DoB) - MONTH(@cDate) > 0 THEN 1 

    --If date of birth day less than date passed subtract one year
    WHEN MONTH(@DoB) - MONTH(@cDate) = 0 AND DAY(@DoB) - DAY(@cDate) > 0 THEN 1 

    --All cases passed subtract zero
    ELSE 0
END
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