Get difference in years between two dates in MySQL as an integer

Question

I am trying to calculate how old is a person in a database.
Let\'s suppose to have this simple table:

student(id, birth_date);

Where

Answer 1

The accepted answer is almost correct, but can lead to wrong results.

In fact, / 365 doesn't take into consideration leap years, and can lead to falsy results if you compare a date that has the same day&month than the birthdate.

In order to be more accurate, you have to divide it by the average days in years for 4 years, aka (365 * 4) + 1 (the leap year every 4 years) => 365.25

And you will be more accurate :

select id, floor(datediff(curdate(),birth_date) / 365.25) from student

Tested for one of my project and it's working.

Answer 2

select id, floor(datediff(curdate(),birth_date) / 365)
from student

What about flooring the result to be an integer?

Answer 3

You can use this to get integer value.

select id, CAST(datediff(curdate(),birth_date) / 365 as int)
from student

If you want to read about CONVERT() and CAST() here is the link.