mysql 添加索引命令

1.PRIMARY  KEY（主键索引）mysql>ALTER  TABLE  `table_name`  ADD  PRIMARY  KEY (  `column`  ) 2.UNIQUE(唯一索引)        mysql>ALTER  TABLE  `table_name`  ADD  UNIQUE (`column` ) 3.INDEX(普通索引)mysql>ALTER  TABLE  `table_name`  ADD  INDEX index_name (  `column`  )4.FULLTEXT(全文索引)mysql>ALTER  TABLE  `table_name`  ADD  FULLTEXT ( `column` )5.多列索引mysql>ALTER  TABLE  `table_name`  ADD  INDEX index_name (  `column1`,  `column2`,  `column3`  )