MySQL Calculate age by year month and day

Question

I want to display data of patients age.

mysql> select nama,gender,dob,TIMESTAMPDIFF(YEAR,dob,now()) as age from sampelaja;
+------------------+--------+------------+------+
| nama             | gender | dob        | age  |
+------------------+--------+------------+------+
| Rizkiyandi       |      1 | 2010-05-21 |    4 |
| Siti Khodijah    |      0 | 1980-03-15 |   34 |
| Aisyah Az-zahra  |      0 | 1986-08-17 |   28 |
| Paritem          |      0 | 2005-12-13 |    8 |
| Ngadimin         |      1 | 2014-08-28 |    0 |
+------------------+--------+------------+------+

10 rows in set (0.00 sec)

Here there is a problem when there is a 4-day-old baby who is regarded as the age of 0 year I want a result like this

+------------------+--------+------------+------+-------+------+
| nama             | gender | dob        | year | month | day  |
+------------------+--------+------------+------+-------+------+
| Rizkiyandi       |      1 | 2010-05-21 |    4 |     3 |   13 |
| Siti Khodijah    |      0 | 1980-03-15 |   34 |     5 |   18 |
| Aisyah Az-zahra  |      0 | 1986-08-17 |   28 |     0 |   16 |
| Paritem          |      0 | 2005-12-13 |    8 |     8 |   20 |
| Ngadimin         |      1 | 2014-08-28 |    0 |     0 |    6 |
+------------------+--------+------------+------+-------+------+

Answer 1

You can use modulo to determine count of months and days:

SELECT
      nama
    , gender
    , dob
    , TIMESTAMPDIFF( YEAR, dob, now() ) as _year
    , TIMESTAMPDIFF( MONTH, dob, now() ) % 12 as _month
    , FLOOR( TIMESTAMPDIFF( DAY, dob, now() ) % 30.4375 ) as _day
FROM 
    sampelaja

The result is:

+-----------------+--------+------------+-------+--------+------+
| nama            | gender | dob        | _year | _month | _day |
+-----------------+--------+------------+-------+--------+------+
| Rizkiyandi      |      1 | 2010-05-21 |     4 |      3 |   13 |
| Siti Khodijah   |      0 | 1980-03-15 |    34 |      5 |   19 |
| Aisyah Az-zahra |      0 | 1986-08-17 |    28 |      0 |   17 |
| Paritem         |      0 | 2005-12-13 |     8 |      8 |   20 |
| Ngadimin        |      1 | 2014-08-28 |     0 |      0 |    6 |
+-----------------+--------+------------+-------+--------+------+

Days are calculated between birthday date from previous month till today.

Number 30.4375 I calculated using this formula: [DAYS IN YEAR]/12, where [DAYS IN YEAR] = 365.25