Hi,
can anyone explain me what's the right way to use the group by clause ?

for instance
PHP Code:
SELECT A.domain_idU.birthday AS fieldDATEaccess_start_datetime ) AS DATECOUNTA.id ) AS value 
FROM stats_access A 
JOIN users U ON U
.id A.fb_id 
GROUP BY DATE
A.access_start_datetime ) , U.birthdayA.domain_id 
with this query I get the number of the users group by access_start_datetime,birthday and domain_id
Is it right ?