sql server - Calculate Age of user WITH Datediff (?) -

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i'm trying use datediff function give me years off user more complicated thought.

select datediff( dd,'1963-07-22','2016-07-23')

this give me 19360 days think because 2016 have leap year , fine.

what year , not days.

if change interval dd yy(yyyy) calculates year.

the correct answer calculate someone's age, or difference in truncated years between 2 dates 

year(@today)-year(@birthdate)+floor((month(@today)-month(@birthdate)+floor((day(@today)-day(@birthdate))/31))/12);

this work regardless of leap years. , correct whether person born on later month or later day in same month. ignore hours , minutes, should when calculating someone's age.


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