mysql加字段
[*]ALTER TABLE — 更改表属性
[*]添加字段：
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[*]alter table `user_movement_log`
[*]Add column GatewayId int not null default 0 AFTER `Regionid` (在哪个字段后面添加)
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[*]删除字段：
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[*]alter table `user_movement_log` drop column Gatewayid
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[*]调整字段顺序：
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[*]ALTER TABLE `user_movement_log` CHANGE `GatewayId` `GatewayId` int not null default 0 AFTER RegionID
[*]mysql alter 语句用法,添加、修改、删除字段等
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[*]//主键549830479
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[*] alter table tabelname add new_field_id int(5) unsigned default 0 not null auto_increment ,add primary key (new_field_id);
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[*]//增加一个新列549830479
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[*] alter table t2 add d timestamp;
[*]alter table infos add ex tinyint not null default '0';
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[*]//删除列549830479
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[*] alter table t2 drop column c;
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[*]//重命名列549830479
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[*] alter table t1 change a b integer;
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[*]//改变列的类型549830479
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[*] alter table t1 change b b bigint not null;
[*]alter table infos change list list tinyint not null default '0';
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[*]//重命名表549830479
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[*] alter table t1 rename t2;
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[*]加索引549830479
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[*] 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);
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[*]加主关键字的索引549830479
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[*]mysql> alter table tablename add primary key(id);
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[*]加唯一限制条件的索引549830479
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[*] mysql> alter table tablename add unique emp_name2(cardnumber);
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[*]删除某个索引549830479
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[*] mysql>alter table tablename drop index emp_name;
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[*]修改表：549830479
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[*]增加字段：549830479
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[*] mysql> ALTER TABLE table_name ADD field_name field_type;
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[*]修改原字段名称及类型：549830479
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[*] mysql> ALTER TABLE table_name CHANGE old_field_name new_field_name field_type;
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[*]删除字段：549830479
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[*] mysql> ALTER TABLE table_name DROP field_name;
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