SQL按日期分组不起作用

Question

I have this SQL code:

SELECT EXTRACT(MONTH FROM timestamp) AS StatMonth, timestamp
  FROM server_stats
 GROUP BY StatMonth
 ORDER BY StatMonth DESC;

Schema:

CREATE TABLE IF NOT EXISTS `server_stats` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `timestamp` int(11) NOT NULL,
  `players_online` bigint(20) NOT NULL,
  `active_players` bigint(20) NOT NULL,
  `total_copper` bigint(20) NOT NULL,
  `total_items` bigint(20) NOT NULL,
  `total_item_weight` bigint(20) NOT NULL,
  `total_houses` bigint(20) NOT NULL,
  `total_boats` bigint(20) NOT NULL,
  `total_pets` bigint(20) NOT NULL,
  `total_experience` bigint(20) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=MyISAM  DEFAULT CHARSET=latin1 AUTO_INCREMENT=63 ;

Sample data:

INSERT INTO `server_stats` (`id`, `timestamp`, `players_online`, `active_players`,
        `total_copper`, `total_items`, `total_item_weight`, `total_houses`,
        `total_boats`, `total_pets`, `total_experience`) VALUES
(53, 1317288600, 227, 718, 155037828, 68231283, 25169498, 14822, 2112, 683, 7776385802),
(54, 1317290400, 224, 718, 155038479, 68233576, 25163526, 14822, 2112, 683, 7776669410),
(55, 1317292200, 215, 718, 155100860, 68239613, 25160397, 14822, 2112, 683, 7776933725),
(56, 1317294000, 201, 717, 155095895, 68240842, 25159809, 14822, 2112, 683, 7777196134),
(57, 1317295800, 204, 718, 155090280, 68248539, 25170275, 14822, 2112, 683, 7777419238),
(58, 1317297600, 194, 718, 155105906, 68259213, 25163212, 14823, 2112, 683, 7777657681),
(59, 1317682800, 230, 724, 157323143, 68731571, 25185326, 14908, 2119, 692, 7834358253),
(60, 1317684600, 213, 724, 157323178, 68733325, 25186412, 14908, 2119, 692, 7834637558),
(61, 1317686400, 219, 724, 157314147, 68737824, 25197057, 14908, 2119, 692, 7834904982),
(62, 1317688200, 225, 725, 157329100, 68736384, 25190554, 14909, 2119, 692, 7835169244);

I am using the SELECT statement above to display each month. Which in this case should be September (9) and October (10). However, it is only displaying September, not October.

Can someone explain this to me?

Answer 1

如果您使用MONTH FROM from_unixtime(timestamp) ，这在MySQL 5.1中可以正常工作。