假設您的地址總是在格式<numbers><space><city>
SELECT
DISTINCT TRIM(LEADING SUBSTRING_INDEX(address, ' ', 1) FROM address) AS city
FROM
locations
這是我用來驗證測試數據查詢工作。請注意,我將測試表命名爲locations
。我的MySQL服務器是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');
這是我對這個表運行的精確查詢:
SELECT DISTINCT TRIM(
LEADING SUBSTRING_INDEX(address, ' ', 1)
FROM address) AS city
FROM locations
這是我得到的結果是:
**city**
Hollywood
Boston
New York
Chicago
是多少部分「地址」字段,還是不同字段中的記錄ID?如果它是相同的領域,這可能會更困難。 – 2010-10-15 23:21:48
呃,'極限1'沒有辦法嗎? – Wrikken 2010-10-15 23:27:43