Mysql adds columns, modifies column names, column attributes, deletes columns, and mysql column names.

Mysql adds columns, modifies column names, column attributes, deletes columns, and mysql column names.
Mysql modifies the table name, column name, column type, adds a table column, and deletes a table column.

Alter table test rename test1; -- modify the table name

Alter table test add column name varchar (10); -- add a table column

Alter table test drop column name; -- delete a table column

Alter table test modify address char (10) -- modify the table column type
| Alter table test change address char (40)


Alter table test change column address address1 varchar (30) -- modify the table column name