选择一个有很多＆＃39; mySQL查询

Question

我在mySQL中有两个表。 coffee_users和coffee_product_registrations。每个用户可以拥有多个产品注册。我尝试选择产品注册次数超过1的用户，但我收到以下错误：

#1054 - Unknown column 'coffee_users.uid' in 'on clause'  

执行此操作时：

SELECT c.uid
FROM 
  `coffee_users` as c
  JOIN (
    select uid
    from `coffee_users`
    group by `uid`
    having count(*)>1
  ) coffee_product_registrations
     on coffee_users.uid = coffee_product_registrations.uid

这可行吗？

Answer 1

也许这就是你想要的？

SELECT c.uid 
FROM coffee_users c 
JOIN coffee_product_registrations cpr on c.uid = cpr.uid
GROUP BY c.uid 
HAVING COUNT(cpr.id) > 1