mysql分组统计sql

SELECT wb.sid, wb.nid, wb.uid
FROM `mama_webform_submissions` wb
LEFT JOIN shared_users user ON user.uid = wb.uid
WHERE user.created
BETWEEN 1298937600 
AND 1301616000 
ORDER BY user.uid ASC 


我想从shared_users统计每个用户参加多少调查问卷mama_webform_submissions
结果以
user.uid 参加的个数列出来，谢谢
例如:
uid 次数
1 20

贴记录及要求结果出来看

SELECT user.uid,count(*)
FROM shared_users user 
LEFT JOIN `mama_webform_submissions` wb ON user.uid = wb.uid
WHERE user.created
BETWEEN 1298937600  
AND 1301616000  
group by user.uid
ORDER BY user.uid ASC