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copied!<pre><code>create table t1(id int, name varchar(100)); alter table t11 add index name_idx(name); mysql> show create table t11; +-------+--------------------------------------------------------------------------------------------------------------------------------------------------------+ | Table | Create Table | +-------+--------------------------------------------------------------------------------------------------------------------------------------------------------+ | t11 | CREATE TABLE `t11` ( `id` int(11) DEFAULT NULL, `name` varchar(100) DEFAULT NULL, KEY `name_idx` (`name`) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 | +-------+--------------------------------------------------------------------------------------------------------------------------------------------------------+ 1 row in set (0.00 sec) alter table t11 change column name name1 varchar(100); mysql> show create table t11; +-------+----------------------------------------------------------------------------------------------------------------------------------------------------------+ | Table | Create Table | +-------+----------------------------------------------------------------------------------------------------------------------------------------------------------+ | t11 | CREATE TABLE `t11` ( `id` int(11) DEFAULT NULL, `name1` varchar(100) DEFAULT NULL, KEY `name_idx` (`name1`) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 | +-------+----------------------------------------------------------------------------------------------------------------------------------------------------------+ 1 row in set (0.00 sec) </code></pre> <p><strong>mysql will auto change the indexes for u and does not rebuild index</strong></p>

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