计算从特定日期开始的年数SQL

Question

I want to count the amount of years from a the year the person is born to today. I have the components to use but dont know how to use them.

SELECT COLUMN1, COLUMN2, DATEPART(YY,GETDATE()),
CONVERT(INT,+19)))LEFT(TABLE.COLUMN,2)

I want to use the +19 to show it before the birtyear. Example in the database the birthyear is showed as YY not YYYY. That is why I want to add the 19, so the SQL will count years from 19YY to 2013.

Answer 1

Try this

SELECT  id
    ,   Name
    ,   DATEDIFF(yy, CONVERT(DATETIME, DOB), GETDATE()) AS AGE
    ,   DOB
FROM MyTable

Answer 2

declare @DOB date = '19680411'
select datediff(year, @DOB, getdate())- case when month(@DOB)*32 + day(@DOB) > 
month(getdate()) * 32 + day(getdate()) then 1 else 0 end