mysql教程
(1)添加列
alter table <tableName> add column <columnName> varchar(30);
(2)修改列
alter table <tableName> modify column <columnName> int;
(3)删除列
alter table <tableName> drop column <columnName>;
(4)修改列名称
alter table <tableName> change column <oldColumnName> <newColumnName> int;
(5)