Calculating age

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Calculating age

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ELSSON SSC Rookie Points: 32 More actions · Answer 1

Is most simple:
DECLARE @Birthday date = '1994/12/10'

SELECT (CAST(CONVERT(VARCHAR(8), GETDATE(), 112) AS INT) - CAST(CONVERT(VARCHAR(8), @Birthday, 112) AS INT)) / 10000 AS Age

Jeff Moden SSC Guru Points: 1004403 More actions · Answer 2

ELSSON - Thursday, May 4, 2017 2:46 PM
Is most simple:
DECLARE @Birthday date = '1994/12/10'
SELECT (CAST(CONVERT(VARCHAR(8), GETDATE(), 112) AS INT) - CAST(CONVERT(VARCHAR(8), @Birthday, 112) AS INT)) / 10000 AS Age

I've not checked some of the possibilities nor have I checked it for performance but THAT IS mighty interesting especially for how it correctly determines ages when a Leap Day is involved.

--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.

Change is inevitable... Change for the better is not.

Helpful Links:
How to post code problems
How to Post Performance Problems
Create a Tally Function (fnTally)

ELSSON SSC Rookie Points: 32 More actions · Answer 3

Jeff Moden - Friday, May 5, 2017 5:53 AM
ELSSON - Thursday, May 4, 2017 2:46 PM
Is most simple:
DECLARE @Birthday date = '1994/12/10'
SELECT (CAST(CONVERT(VARCHAR(8), GETDATE(), 112) AS INT) - CAST(CONVERT(VARCHAR(8), @Birthday, 112) AS INT)) / 10000 AS Age
I've not checked some of the possibilities nor have I checked it for performance but THAT IS mighty interesting especially for how it correctly determines ages when a Leap Day is involved.

Thanks, this solution is ideal for BI, since the IDs of the dates are numbers of the same (Example "2017/05/05" has ID 20170505), so that the IDs would be used directly. This method is based on mathematics and bit-shift (in this case decimal shift)