mysql SQL语句积累

mysql sql语句积累,学习mysql的朋友可以参考下。

–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;