Question

      CREATE TABLE IF NOT EXISTS `table` (
      `id` int(11) NOT NULL DEFAULT '0',
      `uniq_id` int(11) NOT NULL DEFAULT '0',
      `uniq_cat` varchar(20) NOT NULL DEFAULT '0',
      `value` varchar(255) NOT NULL
    );

 ALTER TABLE `table`
 ADD PRIMARY KEY (`id`), 
 ADD UNIQUE KEY `uniq_id` (`uniq_id`,`uniq_cat`);

 INSERT INTO `table` (uniq_id, uniq_cat, value) 
 VALUES ("1", "1", "ONE") 
 ON DUPLICATE KEY UPDATE value = value;

 INSERT INTO `table` (uniq_id, uniq_cat, value) 
 VALUES ("1", "1", "TWO") 
 ON DUPLICATE KEY UPDATE value = value;

 SELECT * FROM `table`

给出值=＆＃34; ONE＆＃34;
为什么？？？
在第二次插入时，应该从＆＃34; ONE＆＃34;到＆＃34; TWO＆＃34;但这不会发生

http://sqlfiddle.com/#!2/e443e/1

Answer 1

insert into...ON DUPLICATE KEY存在语法问题。试试这个：

 INSERT INTO `table` (uniq_id, uniq_cat, value) 
 VALUES ("1", "1", "ONE") 
 ON DUPLICATE KEY UPDATE value = values(value);

 INSERT INTO `table` (uniq_id, uniq_cat, value) 
 VALUES ("1", "1", "TWO") 
 ON DUPLICATE KEY UPDATE value = values(value);

<强> SQLFIDDLE DEMO

mysql：在重复键（多个唯一，而不是pimary键）上插入〜更新。不起作用

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