mysql SQL语句积累

--重命名表 

rename table t_softwareport to software_port; 

--建立外键 

alter table software_port add constraint fk_software_port_softwareprocessid foreign key (softwareprocessid) references software_process (id) on delete restrict on update restrict; 

--删除列 
alter table software_type drop column upid, drop column orderid; 

--修改列名 
alter table software_process change software_id softwareid int(11) not null; 

--更改列编码 

alter table cms_contentbody modify column offical_site_name varchar(30) character set utf8 collate utf8_unicode_ci not null; 

--增加列 

alter table cms_flash add name varchar(30) not null unique;