How to calculate difference between two dates in months in MySQL

Question

I have two columns in a MySQL table:

• DateOfService (datetime)
• BirthDate (date)

I want to run a MySQL query that will provide date diffe

Answer 1

Based on a summary of all answers and a Google search, I think there are four almost similar ways to write it:

1)

TIMESTAMPDIFF(MONTH, Start_date, End_date) AS Period

E.g.

TIMESTAMPDIFF(MONTH, MIN(r.rental_date), MAX(r.rental_date)) AS Period

2)

PERIOD_DIFF(date_format(now(), '%Y%m'), date_format(time, '%Y%m')) as months

Or

PERIOD_DIFF(date_format(End_date(), '%Y%m'), date_format(Start_date, '%Y%m')) as months

E.g.

PERIOD_DIFF(date_format(MAX(r.rental_date), '%Y%m'), date_format(MIN(r.rental_date), '%Y%m')) as months

3)

PERIOD_DIFF(EXTRACT(YEAR_MONTH FROM NOW()), EXTRACT(YEAR_MONTH FROM time)) AS months

OR

PERIOD_DIFF(EXTRACT(YEAR_MONTH FROM End_date()), EXTRACT(YEAR_MONTH FROM Start_date)) AS months

E.g.

PERIOD_DIFF(EXTRACT(YEAR_MONTH FROM MAX(r.rental_date)), EXTRACT(YEAR_MONTH FROM MIN(r.rental_date))) as Months

4)

PERIOD_DIFF(concat(year(d1),if(month(d1)<10,'0',''),month(d1)), concat(year(d2),if(month(d2)<10,'0',''),month(d2))) as Months**

E.g.

PERIOD_DIFF(
            concat(year(MAX(r.rental_date)),if(month(MAX(r.rental_date))<10,'0',''),month(MAX(r.rental_date))),
            concat(year(MIN(r.rental_date)),if(month(MIN(r.rental_date))<10,'0',''),month(MIN(r.rental_date)))
           ) as Months