mysql alter example

標籤：

alter table `user_movement_log` Add column GatewayId int not null default 0 AFTER `Regionid` (在哪個欄位後面添加) alter table x_connection add `FEX-N752` varchar(10) default null;//主鍵alter table tabelname add new_field_id int(5) unsigned default 0 not null auto_increment ,add primary key (new_field_id);//增加一個新列alter table t2 add d timestamp; alter table infos add ex tinyint not null default ‘0‘;//刪除列alter table t2 drop column c;//重新命名列alter table t1 change a b integer;//改變列的類型alter table t1 change b b bigint not null; alter table infos change list list tinyint not null default ‘0‘;//重新命名表alter table t1 rename t2;加索引mysql> alter table tablename change depno depno int(5) not null; mysql> alter table tablename add index 索引名 (欄位名1[，欄位名2 …]); mysql> alter table tablename add index emp_name (name);加主關鍵字的索引mysql> alter table tablename add primary key(id);加唯一限制條件的索引mysql> alter table tablename add unique emp_name2(cardnumber);刪除某個索引mysql>alter table tablename drop index emp_name;修改表：增加欄位：mysql> ALTER TABLE table_name ADD field_name field_type;修改原欄位名稱及類型：mysql> ALTER TABLE table_name CHANGE old_field_name new_field_name field_type;eg:alter table dip_mr_log change map_output_byte map_output_byte bigint unsigned DEFAULT ‘0‘;   刪除欄位：mysql> ALTER TABLE table_name DROP field_name;  

 

mysql alter example