mysql 创建索引

ALTER TABLE `table_name` ADD PRIMARY KEY ( `column` )
'table_name' 表名
column 字段

将table_name表的column字段设置为主键；

ALTER TABLE `table_name` ADD UNIQUE ( `column` );

写法一：ALTER TABLE `table_name` ADD INDEX index_name ( `column` )
写法二：CREATE INDEX index_name ON `table_name`(`column1`,`column2`,`column3`);

ALTER TABLE `table_name` ADD FULLTEXT ( `column`)

写法一：ALTER TABLE `table_name` ADD INDEX index_name ( `column1`, `column2`, `column3` )

写法二：CREATE INDEX index_name ON `table_name`(`column1`,`column2`,`column3`)

SHOW INDEX FROM `table_name`;


7. 删除索引

DROP INDEX index_name ON `table_name`;