MYSQL查询计数表行

Question

I made a program with this code:

select DATE_FORMAT(DATE_ADD(Birth_Date, INTERVAL '55 - 1' YEAR_MONTH), '01-%m-%Y')
AS Retire_Date
FROM employee

The question is how can I count amount of record Retire_Date in this month (example: February, 2016)?

NOTE : retire_date column isn't exist on database data

Answer 1

If I understood correctly, you want a query that returns how many people are retiring/retired in this the current month so:

SELECT count(*)
from employee
where year(DATE_FORMAT(DATE_ADD(Birth_Date, INTERVAL '55 - 1' YEAR_MONTH), '01-%m-%Y')) = year(curdate())
      and month(DATE_FORMAT(DATE_ADD(Birth_Date, INTERVAL '55 - 1' YEAR_MONTH), '01-%m-%Y')) = month(curdate())

Is this what you meant?