考虑这个查询(DEMO IS HERE)
(SELECT * FROM `titles` where title = 'test\\')
UNION ALL
(SELECT * FROM `titles` where title LIKE 'test\\\\')
输出:
| ID | TITLE |
--------------
| 1 | test\ |
| 1 | test\ |
问题:
为什么(=)不需要额外的(\)，但(比如)额外的\\是必需的？
表格信息:
CREATE TABLE IF NOT EXISTS `titles` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`title` varchar(255) CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=7 ;
--
-- Dumping data for table `titles`
--
INSERT INTO `titles` (`id`, `title`) VALUES
(1, 'test\\');