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QQ-485619
QQ-485619
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I have a table called member which contains memberid and DOB. How can I calculate age to date based on Date of Birth.

Thanks,
ColdCoffee
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You can use DATEDIFF function:

LIke:

SET DATEFORMAT DMY
SELECT DATEDIFF(yy,'21-03-1985',GETDATE()) AGE


WayneS
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ColdCoffee (5/26/2010)
You can use DATEDIFF function:

LIke:

SET DATEFORMAT DMY
SELECT DATEDIFF(yy,'21-03-1985',GETDATE()) AGE


Since DateDiff returns the number of boundaries crossed in comparing these two dates, it will report the wrong age if today's date is not >= your DOB. So, use this instead:

SELECT CASE WHEN datepart(dayofyear, GetDate() ) >= datepart(dayofyear, @DOB)
THEN DATEDIFF(yy,@DOB,GETDATE())
ELSE DATEDIFF(yy,@DOB,GETDATE()) -1
END AGE



Wayne
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Author - SQL Server T-SQL Recipes
If you can't explain to another person how the code that you're copying from the internet works, then DON'T USE IT on a production system! After all, you will be the one supporting it!
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ColdCoffee
ColdCoffee
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WayneS (5/26/2010)
ColdCoffee (5/26/2010)
You can use DATEDIFF function:

LIke:

SET DATEFORMAT DMY
SELECT DATEDIFF(yy,'21-03-1985',GETDATE()) AGE


Since DateDiff returns the number of boundaries crossed in comparing these two dates, it will report the wrong age if today's date is not >= your DOB. So, use this instead:

SELECT CASE WHEN datepart(dayofyear, GetDate() ) >= datepart(dayofyear, @DOB)
THEN DATEDIFF(yy,@DOB,GETDATE())
ELSE DATEDIFF(yy,@DOB,GETDATE()) -1
END AGE


That perfectly makes sense!
How sweet it is to start the day with learning a titbit.. wow
Thanks Wayne Shef! :-)
Adam Gojdas
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Another way to calculate the age is:

SELECT (ABS(CAST(CONVERT(char(8),GETDATE(),112) AS int)
- CAST(CONVERT(char(8),@DOB,112) AS int)) / 10000) [AGE];



Here is a link to where I originally saw this type of calculation. It is in the comments section. :
http://www.sqlmag.com/article/tsql3/datetime-calculations-part-5.aspx
Lynn Pettis
Lynn Pettis
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You can also check out this article and the discussion that followed.

Cool
Lynn Pettis

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I'd second Lynn's article. It's a good discussion of this topic.

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mitch 14804
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Wayne,

This doesn't work on leap years.

Try these dates:
@DOB = '09/26/2011'
GetDate() = '09/25/2012'

mitch
Michael Valentine Jones
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Group: General Forum Members
Points: 3254 Visits: 11771
You can use the function on the link below to find the age:
Age Function F_AGE_IN_YEARS
http://www.sqlteam.com/forums/topic.asp?TOPIC_ID=74462
Jeff Moden
Jeff Moden
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Adam Gojdas (5/28/2010)
Another way to calculate the age is:

SELECT (ABS(CAST(CONVERT(char(8),GETDATE(),112) AS int)
- CAST(CONVERT(char(8),@DOB,112) AS int)) / 10000) [AGE];



Here is a link to where I originally saw this type of calculation. It is in the comments section. :
http://www.sqlmag.com/article/tsql3/datetime-calculations-part-5.aspx


Careful now... Because of the date conversions to the CHAR datatype, that will be relatively slow.

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
Although they tell us that they want it real bad, our primary goal is to ensure that we dont actually give it to them that way.
Although change is inevitable, change for the better is not.
Just because you can do something in PowerShell, doesnt mean you should. Wink

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