SQL操作

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`  )

6. 增加列
ALTER TABLE  `table_name` ADD  `no` VARCHAR( 50 ) NOT NULL ;
ALTER TABLE  `table_name` ADD  `state` INT NOT NULL AFTER  `no` ;

7. 修改列
ALTER TABLE  `table_name` CHANGE  `column1`  `column1` CHAR( 100 ) NOT NULL ;

8. 删除列
ALTER TABLE `table_name` DROP `state`;