MySQL Query to get age from date of birth

Question

I have an issue with my query,

SELECT id, pseudo, nom, prenom, sexe, ville, 
       FLOOR(DATEDIFF (NOW(), date_naissance)/365) AS mAge 
FROM user 
WHERE sexe         


        

Answer 1

I use this query to get age of the user (years and months)

SELECT 
username
,date_of_birth
,(PERIOD_DIFF( DATE_FORMAT(CURDATE(), '%Y%m') , DATE_FORMAT(date_of_birth, '%Y%m') )) DIV 12 AS years
,(PERIOD_DIFF( DATE_FORMAT(CURDATE(), '%Y%m') , DATE_FORMAT(date_of_birth, '%Y%m') )) MOD 12 AS months
FROM users

Result as of today:

chucknorris, 1979-04-10 00:00:00, 35, 2

Answer 2

You can not use column aliases in WHERE clauses: http://dev.mysql.com/doc/refman/5.0/en/problems-with-alias.html.

You will have to rethink your query or change to:

SELECT id, pseudo, nom, prenom, sexe, ville, 
   FLOOR(DATEDIFF (NOW(), date_naissance)/365) AS mAge 
FROM user 
WHERE sexe = 'Homme' AND 
FLOOR(DATEDIFF (NOW(), date_naissance)/365) BETWEEN 18 AND 25 
OR ville = 'Bordeaux'

Ps you may also want to have a look at your ANDs and ORs as well as you might want to include some brackets.