At 17:15 -0500 3/30/02, Michael Stassen wrote:
>On Sat, 30 Mar 2002, Paul DuBois wrote:
>
>> At 21:25 +0100 3/30/02, Roger Baklund wrote:
>> >* Son Nguyen
>> >> ==> I tried this query, but... it's not working out:
>> >> SELECT YEAR(now()-birthday) from users where loginName="test";
>> >
>> >You are very close:
>> >
>> >SELECT YEAR(now())-YEAR(birthday) as age from users where loginName="test";
>>
>> That won't adjust for the relative difference within the calendar
>> year of the two dates. This works better:
>>
>> mysql> SELECT
>> -> YEAR(CURDATE()) - YEAR(birthday)
>> -> - IF(RIGHT(CURDATE(),5) < RIGHT(birthday,5),1,0)
>> -> AS 'age in years'
>> -> FROM users WHERRE loginName="test";
>
>Or
>
> SELECT
> YEAR(FROM_DAYS(TO_DAYS(CURDATE()) - TO_DAYS(birthday)))
> AS 'age in years'
> FROM users WHERE loginName='test';
>
>Michael
mysql> SET @birth = CURDATE() - INTERVAL 1 YEAR;
mysql> SELECT
-> CURDATE(), @birth,
-> YEAR(FROM_DAYS(TO_DAYS(CURDATE()) - TO_DAYS(@birth)))
-> AS 'age in years';
+------------+------------+--------------+
| CURDATE() | @birth | age in years |
+------------+------------+--------------+
| 2002-03-30 | 2001-03-30 | 0 |
+------------+------------+--------------+
mysql> SELECT
-> CURDATE(), @birth,
-> YEAR(CURDATE()) - YEAR(@birth)
-> - IF(RIGHT(CURDATE(),5) < RIGHT(@birth,5),1,0)
-> AS 'age in years';
+------------+------------+--------------+
| CURDATE() | @birth | age in years |
+------------+------------+--------------+
| 2002-03-30 | 2001-03-30 | 1 |
+------------+------------+--------------+
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