假设您的地址总是在格式<numbers><space><city>
SELECT
DISTINCT TRIM(LEADING SUBSTRING_INDEX(address, ' ', 1) FROM address) AS city
FROM
locations
这是我用来验证测试数据查询工作。请注意,我将测试表命名为locations
。我的MySQL服务器是5.1.36版本:
--
-- Table structure for table `locations`
--
CREATE TABLE IF NOT EXISTS `locations` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`address` varchar(255) COLLATE utf8_bin DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `address` (`address`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_bin AUTO_INCREMENT=6 ;
--
-- Dumping data for table `locations`
--
INSERT INTO `locations` (`id`, `address`) VALUES
(1, '123 Hollywood'),
(2, '345 New York'),
(3, '847 Hollywood'),
(4, '192 Boston'),
(5, '876 Chicago');
这是我对这个表运行的精确查询:
SELECT DISTINCT TRIM(
LEADING SUBSTRING_INDEX(address, ' ', 1)
FROM address) AS city
FROM locations
这是我得到的结果是:
**city**
Hollywood
Boston
New York
Chicago
是多少部分“地址”字段,还是不同字段中的记录ID?如果它是相同的领域,这可能会更困难。 – 2010-10-15 23:21:48
呃,'极限1'没有办法吗? – Wrikken 2010-10-15 23:27:43