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 (字段名1[，字段名2 …]);
mysql> alter table tablename add index emp_name (name);
加主關(guān)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;
Gran權(quán)限
添加新用戶
insert into user (Host,User,Password) values ("%","testuser",PASSWORD("123123"));
flush privileges;
為數(shù)據(jù)庫授權(quán)用戶
grant all privileges on cplusplusDB.* to cplusplus@localhost identifiedby ‘cplusplus.me';
flush privileges;
