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CREATE TABLE `t_group` (
`id` int(11) NOT NULL auto_increment,
`money` decimal(10,2) NOT NULL,
`user_name` varchar(20) NOT NULL,
`create_time` timestamp NOT NULL default CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP,
PRIMARY KEY (`id`),
KEY `idx_combination1` (`user_name`,`money`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8;
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mysql> select count(*) from t_group;
+----------+
| count(*) |
+----------+
| 10485760 |
+----------+
1 row in set (0.00 sec)
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CREATE TABLE `t_group_ids` (
`id` int(11) NOT NULL,
`group_id` int(11) NOT NULL,
PRIMARY KEY (`id`,`group_id`),
KEY `idx_id` (`id`),
KEY `idx_group_id` (`group_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
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mysql> insert into t_group_ids select ceil(id/20),id from t_group;
Query OK, 10485760 rows affected (2 min 56.19 sec)
Records: 10485760 Duplicates: 0 Warnings: 0
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mysql> select * from t_group where 1 limit 20;
+----+--------+-----------+---------------------+
| id | money | user_name | create_time |
+----+--------+-----------+---------------------+
| 1 | 50.23 | david | 2008-10-23 12:55:49 |
| 2 | 55.23 | livia | 2008-10-23 10:02:09 |
| 3 | 100.83 | leo | 2008-10-23 10:02:22 |
| 4 | 99.99 | lucy | 2008-10-23 10:02:39 |
| 5 | 299.99 | simon | 2008-10-23 10:02:52 |
| 6
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