alter table test add column name varchar(10) not null default '' comment 'name';
alter table test drop column name;
delete from test where clause;
alter table test rename test1;
alter table test change column address address1 varchar(30);
alter table test change address address char(40);
## 或者
alter table test modify address char(10) ;
update tablename set columnname = xxx where clause;
show create table tablename;
原文:https://www.cnblogs.com/greatLong/p/12488774.html