Solved

computed age column

Posted on 2014-04-17
6
426 Views
Last Modified: 2014-04-18
I want a computed age column based on DOB.  What the best way to do this?  Is there a built in age function?
0
Comment
Question by:HLRosenberger
  • 3
  • 2
6 Comments
 
LVL 33

Accepted Solution

by:
Big Monty earned 250 total points
ID: 40007048
no, but you can do something like 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

Open in new window

0
 
LVL 69

Assisted Solution

by:Scott Pletcher
Scott Pletcher earned 250 total points
ID: 40007135
>> What the best way to do this? <<

Here's my preferred method.

SELECT
    DATEDIFF(YEAR, dob, GETDATE()) - CASE WHEN CONVERT(char(5), dob, 1) > CONVERT(char(5), GETDATE(), 1) THEN 1 ELSE 0 END as age

Leap year birthdays are the tricky part.  The code above treats Mar 1 as the birthday for someone born on Feb 29.  Code will need adjusted if you need to consider Feb 28 their birthday in non-leap years (believe it or not, some govts actually have laws on how this needs calculated, esp. for retirement, years-of-service, etc.).



>>  Is there a built-in age function? <<
No.
0
 
LVL 1

Author Closing Comment

by:HLRosenberger
ID: 40009258
thanks!
0
Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 69

Expert Comment

by:Scott Pletcher
ID: 40009345
Interesting choice.  Exactly one year (or nn years) after my birthday, shouldn't I be one year (or nn years) old?!


DECLARE @dob  datetime
SET @dob=DATEADD(YEAR, -1, GETDATE())

SELECT @dob AS date_of_birth, GETDATE() AS todays_date,
    DATEDIFF(hour,@dob,GETDATE())/8766 AS AgeYearsIntTrunc


SET @dob=DATEADD(YEAR, -10, GETDATE())

SELECT @dob AS date_of_birth, GETDATE() AS todays_date,
    DATEDIFF(hour,@dob,GETDATE())/8766 AS AgeYearsIntTrunc
0
 
LVL 1

Author Comment

by:HLRosenberger
ID: 40009435
ScottPletcher

I do not follow.  I'm working with both solutions trying to get he correct age.
0
 
LVL 69

Expert Comment

by:Scott Pletcher
ID: 40009584
OK, good luck.  I can't imagine that an hours-based method could ever be fully accurate.
0

Featured Post

NFR key for Veeam Backup for Microsoft Office 365

Veeam is happy to provide a free NFR license (for 1 year, up to 10 users). This license allows for the non‑production use of Veeam Backup for Microsoft Office 365 in your home lab without any feature limitations.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
Many to one in one row 2 35
SQL Server Sum Over Multiple Tables 20 30
SSRS Page Header from Group Data 2 21
Need age at date of document 3 8
JSON is being used more and more, besides XML, and you surely wanted to parse the data out into SQL instead of doing it in some Javascript. The below function in SQL Server can do the job for you, returning a quick table with the parsed data.
Slowly Changing Dimension Transformation component in data task flow is very useful for us to manage and control how data changes in SSIS.
Using examples as well as descriptions, and references to Books Online, show the documentation available for datatypes, explain the available data types and show how data can be passed into and out of variables.
Viewers will learn how to use the SELECT statement in SQL and will be exposed to the many uses the SELECT statement has.

713 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