Solved

TSQL - Calculate Age

Posted on 2011-09-04
13
544 Views
Last Modified: 2012-05-12
How do you calculate someones age in years given thier date of birth (@DOB) and a specific date (@Now).

Thanks!
0
Comment
Question by:soozh
  • 4
  • 3
  • 2
  • +3
13 Comments
 
LVL 7

Expert Comment

by:boon86
ID: 36480532
TO_CHAR (CURRENT_TIMESTAMP, 'YYYY') - TO_CHAR (BIRTH_DATE, 'YYYY') AS AGE
0
 
LVL 19

Expert Comment

by:elimesika
ID: 36480554
which db engine are you using , date functions are dependent in that ....
0
 

Author Comment

by:soozh
ID: 36480633
i am usimg sql server 2008
0
PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

 
LVL 59

Accepted Solution

by:
Kevin Cross earned 250 total points
ID: 36480672
Check out ScottPletcher's answer here: http://www.experts-exchange.com/Q_23808219.html
0
 

Author Comment

by:soozh
ID: 36480678
THanks.  I dont think Boon86's solution works... you cant just subtract the years....

For example 1959-Mar-03 to 1960-Jan-01  would give 1 year but infact i would not be one year old until Mar 6th in 1960.
0
 
LVL 59

Expert Comment

by:Kevin Cross
ID: 36480681
Exactly. Scott's solution accounts for that using a CASE statement to check for that condition.
0
 

Author Comment

by:soozh
ID: 36480750
what is wrong wth just subtracting the years and then in the now mointh and now day are less than then month and then day subtract one year.

soimething like...

years = now_year - then_year

if (now_month < then_month) and (now_day < then_day) then
  years = years -1


0
 
LVL 59

Expert Comment

by:Kevin Cross
ID: 36480759
Are you wanting multi-line SQL or singular statement. Remember MS SQL does not have an IF in inline SQL. It uses CASE. If is used in multi-line statements where you could set a variable for years and then decrement it by one if you meet if condition, but WHY when you can do it all at once using CASE.
0
 
LVL 74

Assisted Solution

by:sdstuber
sdstuber earned 250 total points
ID: 36481870
>>> what is wrong ....


nothing,  it might look something like this

datediff(yyyy,DOB,getdate()) - case when datepart(dy,getdate()) >= dateparty(dy,DOB) then 0 else 1 end
0
 
LVL 8

Expert Comment

by:Ghunaima
ID: 36482536
datediff(year,DOB,getdate())-case when dateadd(year, datediff(year,DOB,getdate()), DOB)>=getdate() then 1 else 0 end

Open in new window


will give a more accurate result.
0
 

Author Comment

by:soozh
ID: 36501109
well we are all wrong because neither my algorythm or the TSQL above does not consider leap years.  This is my solution for a function.

ALTER FUNCTION [dbo].[AgeAtOperation]
(
      -- Add the parameters for the function here
      @Personnr varchar(15),
      @OperationDate date
)
RETURNS int
AS
BEGIN
      
 declare @DoB date ;
 declare @Age int ;
 
 set @DoB = dbo.DoB( @Personnr );
 set @Age = datediff(yyyy, @DOB, @OperationDate ) ;
 
 if (datepart(m,@OperationDate) < datepart(m, @DOB))
 or ((datepart(m,@OperationDate) = datepart(m, @DOB)) and (datepart(d,@OperationDate) < datepart(d, @DOB)))
   set @Age = @Age -1 ;
   
 return @Age;


END
0
 
LVL 8

Expert Comment

by:Ghunaima
ID: 36502047
The date functions in SQL like DATEADD & DATEDIFF do take care of leap years & you can confirm this by giving this command.
select dateadd(year, 1, '29-feb-1968')
     , dateadd(year, 2, '29-feb-1968')
     , dateadd(year, 3, '29-feb-1968')
     , dateadd(year, 4, '29-feb-1968')
     , dateadd(year, 5, '29-feb-1968')
     , dateadd(year, 6, '29-feb-1968')
     , dateadd(year, 7, '29-feb-1968')
     , dateadd(year, 8, '29-feb-1968')
     , dateadd(year, 9, '29-feb-1968')

Open in new window



As per my previous query posted simply change the comparison from ">=" to ">" & you will get the correct result.
 
datediff(year,DOB,getdate())-case when dateadd(year, datediff(year,DOB,getdate()), DOB)>getdate() then 1 else 0 end

Open in new window

0

Featured Post

Master Your Team's Linux and Cloud Stack!

The average business loses $13.5M per year to ineffective training (per 1,000 employees). Keep ahead of the competition and combine in-person quality with online cost and flexibility by training with Linux Academy.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Naughty Me. While I was changing the database name from DB1 to DB_PROD1 (yep it's not real database name ^v^), I changed the database name and notified my application fellows that I did it. They turn on the application, and everything is working. A …
If you find yourself in this situation “I have used SELECT DISTINCT but I’m getting duplicates” then I'm sorry to say you are using the wrong SQL technique as it only does one thing which is: produces whole rows that are unique. If the results you a…
Established in 1997, Technology Architects has become one of the most reputable technology solutions companies in the country. TA have been providing businesses with cost effective state-of-the-art solutions and unparalleled service that is designed…
The Email Laundry PDF encryption service allows companies to send confidential encrypted  emails to anybody. The PDF document can also contain attachments that are embedded in the encrypted PDF. The password is randomly generated by The Email Laundr…

829 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question