Mysql 如何将sql请求与另一个表中的数据组合

我有两个表，第一个是用户数

 id         int(11) AUTO_INCREMENT
 name       varchar(250)

我有第二个表counts\u数据

 id       int(11) AUTO_INCREMENT
 id_user  int(11) 
 count    int(11) 
 date     datetime

我想从第一个表中选择所有记录，从第二个表中获取一些数据，然后合并它们。我想为第二个表中的一个请求列创建临时数据，其中collect last count和order by date在第二个表中，collect collect倒数第二个count和order by date在第二个表中

INSERT INTO `users_counts` (`id`,`name`) VALUES ('1','John');
INSERT INTO `users_counts` (`id`,`name`) VALUES ('2','Michael');
INSERT INTO `users_counts` (`id`,`name`) VALUES ('3','Den');

INSERT INTO `counts_data` (`id`,`id_user`, `count`, `date`) VALUES ('1','1', '200', '2012.09.09');
INSERT INTO `counts_data` (`id`,`id_user`, `count`, `date`) VALUES ('2','1', '212', '2012.09.01');
INSERT INTO `counts_data` (`id`,`id_user`, `count`, `date`) VALUES ('3','2', '20', '2012.01.09');
INSERT INTO `counts_data` (`id`,`id_user`, `count`, `date`) VALUES ('4','3', '210', '2012.02.09');
INSERT INTO `counts_data` (`id`,`id_user`, `count`, `date`) VALUES ('5','3', '2033', '2012.03.09');
INSERT INTO `counts_data` (`id`,`id_user`, `count`, `date`) VALUES ('6','3', '1', '2012.04.09');

最后，在一个请求之后，我想得到这样的东西

id  name      count  count_before
1   John      200    212
2   Michael   20     0
3   Den       1      2033

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谢谢。

另一种可能的方法：

select uc.id,
       uc.name,
       (select count 
          from counts_data cd 
          where cd.id_user = uc.id
          order by date desc limit 1) as count,
       ifnull((select count 
                 from counts_data cd 
                 where cd.id_user = uc.id 
                 order by date desc limit 1 offset 1),0) as count_before
from users_counts uc;

因为每行/记录只需要counts_数据中的一个值，所以可以在mySQL中使用在线查询

select uc.id,
       uc.name,
       (select count 
          from counts_data cd 
          where cd.id_user = uc.id
          order by date desc limit 1) as count,
       ifnull((select count 
                 from counts_data cd 
                 where cd.id_user = uc.id 
                 order by date desc limit 1 offset 1),0) as count_before
from users_counts uc;